Which of the Following Is Not an Example of the Use

Which of the following is not an example of the use of the problem solving perspective provided by economics?

A) An investor considers the tax consequences of selling stocks in order to buy bonds (which she believes offer a better return) .
B) A rancher recognizes that raising more cattle this year will damage his pasture and limit next year's herd size.
C) The Fogelberg family takes its vacation at Lake Arrowhead this year simply because they have done so for as long as anyone can remember.
D) An economics student contemplates the other subjects that she should be studying before deciding to study economics this evening.