After graduating from high school sue chose to attend college rather than join the work force the opportunity cost of her decision is the money she would have made if she had chosen a job over school

Yes this is true.

Explanation:

Opportunity cost is defined as the worth and value of the next alternative after the preferred choice of an individual. In this case,she graduated from high school and chose to attend college rather than join the work force.

The next alternative after choosing to study is joining the workforce. This is the opportunity cost together with the money she would have made if she had chosen a job over school.

yes i think there would be volunteers