Why does attending college involve an opportunity cost?

College only opens up certain job opportunities.

It takes a lot of time to earn the money needed to pay for college.

College tuition is very expensive.

The money spent on tuition cannot be invested in another way.

The money spent on tuition cannot be invested in another way.

Explanation:

An opportunity cost the loss of potential gain from other alternatives when one alternative is chosen.

The only option listed that has another alternative is the fourth choice, which mentions investing the money in something else. If you spend that money on tuition, you won't be able to invest it in something else, which involves an opportunity cost. You're giving up an option (investing your money in something else) in order to go to college.

I think the answer is College only opens up certain job opportunities.