Which of these consumption activities will most likely impose an external cost?

a.a young mother exercises to a yoga video

b.an executive plays a vigorous game of golf

c.a construction worker eats a sandwich during his lunch breakd.

a student in a dorm plays a YouTube video at 120 decibels late at night

What happens when scientists make good assumptions?

a.They can leave out necessary variables that may result in incorrect answers.

b.They are capable of eliminating invalid causations.

c.They further complicate an already complicated subject.

d.They greatly simplify the problem without substantially affecting the answer.

Montana decides to spend three hours working overtime rather than watching Netflix with her friends. She earns $15 an hour. What is her opportunity cost of working?

a.the enjoyment she would have received had she watched Netflix

b.nothing, because she would have received less than $45 of enjoyment from Netflix

c.the $45 minus the enjoyment she would have received from watching Netflix

d.the $45 she earns working