Read the following passage and mark the letter A, B, C, or D to indicate the correct answer to each of the questions from 34 to 40.

Social media has revolutionized how we communicate, connect, and consume information. Platforms like Facebook, Twitter, and Instagram have become central to our daily lives, shaping our interactions and influencing societal trends.

One of the most significant impacts of social media is its ability to connect people across the globe. Through these platforms, individuals can maintain relationships, forge new connections, and find communities that share their interests and values.

This interconnectedness has transformed the way we form relationships, blurring the lines between physical and virtual interactions.

Moreover, social media has opened up information sharing, allowing anyone with internet access to become a content creator and distributor. This has empowered individuals to voice their opinions, share their experiences, and participate in public discourse on a global scale. Social media has played a pivotal role in driving social movements, raising awareness about important issues, and holding institutions accountable.

However, social media also presents challenges and concerns. The commodification of personal data, privacy breaches, and the spread of misinformation are prevalent issues that have sparked debates about online ethics and regulation. Furthermore, the addictive nature of social media, fueled by algorithms designed to maximize user engagement, has raised concerns about its impact on mental health and well-being, particularly among younger generations.

Despite these challenges, social media remains an indispensable tool for communication, expression, and connection in the digital age. It influences every aspect of society, from politics and activism to business and entertainment. Therefore, it is crucial to recognize both the opportunities and pitfalls of social media and work towards harnessing its power for positive change.

What does the word "cornerstone" in paragraph 2 mostly mean? A. essential factor B. dietary supplement C. nutritional value D. common necessaries