Directed Self Placement Testing 2

PASSAGE 1: Luke Redd explores the disputes concerning college tuition in his 2017 essay, “Should College Be Free? Here's What You Need to Consider.” Read the passage from his essay and answer the questions following it. Proponents of free college believe that it would benefit the entire nation, not just the individual students who take advantage of it. They see it as both a private and public benefit. After all, more and more of today's jobs are knowledge-based or require advanced technical skills. So a better-educated workforce would help fill many of the skills gaps that prevent America's economy from growing faster. Plus, since more people would be able to attain employer-desired credentials, more people would be able to take the good-paying jobs that often go unfilled. And that could result in billions of additional dollars circulating throughout the economy since people tend to spend more money when they have higher incomes and little or no debt. It could also mean that the government would take in a lot of extra tax revenues, which could go a long way toward paying for free public colleges. Which of the following best represents the main idea of Passage 1?

If someone added more to this essay, which of the following details would best support the main idea of Passage 1?