Answer:
The BEST option that explains how these details develop a central idea of the article is: "The details describe what led to many free college tuition programs and an effect they have had on students and colleges." The details provided in the passage talk about the history of free college programs and how they date back decades. It also highlights how such programs began to multiply in numbers after the Great Recession when college debt soared, and most future jobs demanded advanced training. It further describes how some states offered full scholarships since the 1990s and how Indiana provided students with free college tuition. Lastly, it talks about a specific program's first-year enrollment, emphasizing its potential impact on students. Altogether, these details show how free college tuition programs originated, their proliferation over time, and their effect on students, making the mentioned option the best explanation that supports the article's central idea.