Globalization refers to the increasing interconnectedness and interdependence of countries through the exchange of goods, services, information, and ideas. It has had a profound impact on various aspects of society, including the flow of ideas across national boundaries. The correct answer to the given question is option 'A', which states that globalization has led to the flow of ideas across national boundaries.

Explanation:
Globalization has facilitated the exchange of ideas between people and cultures from different countries. Here are some key reasons why globalization has led to the flow of ideas across national boundaries:

1. Increased Communication: Globalization has revolutionized communication technologies, making it easier to connect with people from different parts of the world. The advent of the internet, social media platforms, and instant messaging applications has allowed individuals to share ideas, opinions, and information effortlessly.

2. Cultural Exchange: As people from different cultures interact through travel, trade, and migration, their ideas, beliefs, and values are shared. This cultural exchange promotes understanding and encourages the flow of ideas across borders.

3. Educational Exchanges: Globalization has facilitated the exchange of students and scholars across countries. International educational programs, exchange programs, and collaborations between universities have provided opportunities for the exchange of ideas and knowledge.

4. Media and Entertainment: The globalization of media and entertainment industries has played a significant role in the flow of ideas. Movies, television shows, music, and literature from different countries are now widely accessible, allowing people to be exposed to various perspectives and ideas.

5. Global Challenges: Globalization has made people more aware of global challenges such as climate change, poverty, and human rights issues. As a result, ideas and solutions to these challenges are shared across borders to find collective solutions.

6. Technological Advancements: Globalization has spurred technological advancements, which in turn have facilitated the flow of ideas. Innovations in transportation, communication, and information technologies have made it easier for ideas to spread rapidly across national boundaries.

In conclusion, globalization has significantly contributed to the flow of ideas across national boundaries. Through increased communication, cultural exchange, educational exchanges, media, global challenges, and technological advancements, ideas are now shared more freely and easily between individuals and cultures from different countries.