Read the following passage and mark the letter A, B, C, or D to indicate the correct answer to each of the questions.

Vietnam takes pride in its extensive cultural heritage that has evolved over thousands of years, influenced by its indigenous origins, neighboring nations, and colonial past. Nonetheless, the present state of preserving this heritage in Vietnam raises concerns. The rapid pace of urbanization, economic progress, and modernization presents significant obstacles to safeguarding and upholding Vietnam's cultural treasures.

One challenge encountered by Vietnam is the encroachment of urban development upon historical sites and traditional communities. As cities continuously expand and contemporary infrastructure emerges, historical edifices and neighborhoods often confront the risk of demolition or modification. Consequently, this jeopardizes the physical integrity and genuine essence of Vietnam's rich heritage. In response, endeavors are underway to strike a delicate equilibrium between development and preservation. Initiatives have been launched to renovate and repurpose historic structures in a manner that retains their cultural significance and prevents its loss.

Preserving intangible heritage, including traditional crafts, music, and rituals, presents an additional hurdle. The phenomenon of globalized culture and evolving societal dynamics increases the likelihood of these cherished traditions gradually disappearing. Acknowledging this risk, the Vietnamese government and local communities have taken proactive measures to promote and protect intangible heritage. They have organized cultural festivals, craft workshops, and educational initiatives to generate awareness and actively involve younger generations in recognizing the significance of safeguarding their cultural heritage.

Moreover, the impact of tourism on heritage preservation in Vietnam encompasses both favorable and adverse consequences. On the one hand, tourism brings about economic prospects and aids in the conservation of heritage. On the other hand, it can result in excessive commercialization and the commodification of culture. Achieving a harmonious equilibrium between sustainable tourism development and the safeguarding of heritage is of paramount importance. To this end, the Vietnamese government has introduced regulations to regulate tourism activities and encourage responsible travel practices. These measures aim to ensure that heritage sites are treated with respect and preserved for the benefit of future generations.

All in all, the present condition of preserving heritage in Vietnam presents a multifaceted and ever-changing obstacle. As the recognition of cultural heritage's significance grows, endeavors are underway to safeguard and advocate for Vietnam's abundant heritage. Nonetheless, achieving this goal necessitates a careful equilibrium between development and preservation, alongside active community engagement and responsible tourism approaches. These elements are crucial to ensure that Vietnam's cultural treasures not only endure but also flourish, leaving a lasting impact on future generations.

The word "they" in paragraph 2 refers to________ A. valuable skills B. knowledge C. the workforce D. school-leavers