Read the following passage and mark the letter A, B, C or D on your answer sheet to indicate the best answer to each of the following questions from 29 to 33.

Ha Long Bay in Viet Nam's Quang Ninh Province is a UNESCO World Heritage Site known for its spectacular landscapes. Since its recognition in 1994, it has become a magnet for travelers eager to witness its stunning vistas and engage in diverse activities.

The allure of Ha Long Bay lies in its picturesque scenery, characterized by countless limestone formations and mysterious caves rising from the emerald waters. This unique natural wonder has gained international acclaim, offering visitors a plethora of unexpected discoveries with each visit.

Cruising is a favored activity in Ha Long Bay, providing various itineraries that allow tourists to explore numerous caves, soak in the local culture, and experience life on the water. Tours can range from a few hours to overnight stays, offering a remarkable way to experience the bay's beauty.

The culinary offerings of Ha Long Bay are another highlight, renowned for delectable seafood like crabs, prawns, and clams. Sampling the authentic local cuisine at area restaurants is an essential part of the Ha Long Bay experience.

Affordability is a key advantage for visitors to Ha Long Bay, with a wide selection of budget-friendly accommodations and cruise options. Meanwhile, those willing to indulge can find luxury in five-star hotels and opulent cruise ships.

Each visitor's encounter with Ha Long Bay is unique, from serene sunrises amidst the geological formations to memorable dinners in caves or awe-inspiring views from mountaintops. Regardless of the individual experiences, the lasting memories of Ha Long Bay remain indelible in the hearts of all who visit.

In paragraph 1, what does the word "it" refer to? A. UNESCO B. Quang Ninh Province C. Ha Long Bay D. The recognition as a World Heritage Site