If Many People in a Community Get flU Shots, the Whole

Multiple Choice

If many people in a community get flu shots, the whole community benefits, including those who did not get flu shots. Therefore, not enough people may decide to get the shots. This is one illustration of

A) the market allocating resources efficiently.
B) monopoly power due to lack of competition.
C) supply-side market failure.
D) demand-side market failure.