Why Might the FDA Err on the Side of "Overtesting

Why might the FDA err on the side of "overtesting" pharmaceutical drugs compared with the level of testing that is economically efficient?

A) Dangerous side effects are more important than drug loss and drug lag.
B) Dangerous side effects are less important than drug loss and drug lag.
C) Drug lag and drug loss are not significant concerns in the case of most pharmaceutical drugs.
D) Dangerous side effects are not relevant in most pharmaceutical drug cases.