Recall the Application About the Difficulty in Estimating the Size

Recall the Application about the difficulty in estimating the size of multipliers and the historical record of the size of multipliers to answer the following question(s) .
-According to this Application, economists Robert Barro and Charles Redlick found that multipliers ________ when there was more unemployment in the economy.

A) were smaller
B) were larger
C) were negative
D) were unaffected