The Figure Given Below Shows the Revenue and Cost Curves

The figure given below shows the revenue and cost curves of a perfectly competitive firm.Figure 10.2
MC: Marginal cost curve
MR: Marginal revenue curve
ATC: Average-total-cost curve
AVC: Average-variable-cost curve
-A perfectly competitive firm decides to shut down if:

A) the price falls below the average-total-cost.
B) average revenue falls below the average-variable-cost.
C) the price falls below the marginal cost.
D) the average revenue curve lies below the marginal cost curve.
E) the total revenue is less than total cost.