If a Manufacturer Shuts Down in the Short Run,it Must

If a manufacturer shuts down in the short run,it must be true that before the shutdown,at all positive output levels,_____

A) average total cost was less than average variable cost.
B) fixed cost was greater than total revenue.
C) total revenue was greater than the variable cost of production.
D) profit was zero.
E) total cost plus total revenue was less than profit.