Answer:
First of all, opportunity costs are the costs of choosing one alternative activity or investment over another.
A) When you decide to attend college, you are going to pay a lot money instead of working and being able to earn money right away. The opportunity costs of going to college are the lost wages and experience that you could have acquired at a job. Most people who attend college are willing to sacrifice lost wages (at least 4 years of lost wages) and working experience in order to have the possibility of obtaining a better paying job once they graduate.
Questions B and C are directly related to question A, there are no alternative actions presented.