Suppose Karl Divides His Time Between Making Birdhouses and Growing

Multiple Choice

Suppose Karl divides his time between making birdhouses and growing artichokes. Karl's friend recently gave Karl some new woodworking tools that greatly reduced the amount of time it takes Karl to make each birdhouse, but the new tools had no impact on the amount of time it takes Karl to grow artichokes. Thus, the new tools ________ Karl's opportunity cost of growing artichokes.

A) had no effect on
B) decreased
C) increased
D) halved