The most suitable sentence to fit the claim that higher education should be free for everyone, specifically related to the first reason about how the younger generation will benefit from no student debt, is:
C graduates can take longer to find a dream job without having to worry as much about living expenses.
This option directly relates to the idea that alleviating student debt allows graduates to focus more on finding the right job rather than being pressured to take any job for immediate income due to financial concerns.