Suppose the long-run supply curve for a perfectly competitive industry

Suppose the long-run supply curve for a perfectly competitive industry is horizontal at a price of $12, and the minimum short-run average variable cost for each of the identical N firms in the industry is $8. If the demand curve for the industry decreases so that it intersects the short-run supply curve of the industry at $10,

A) in the short run the price will decrease to $10, and the number of firms will still be N. In the long run the price will return to $12, and the number of firms will be less than N.
B) in the short run the price will decrease to $10, and the number of firms will be less than N. In the long run the price will return to $12, and the number of firms will return to N.
C) in the short run the price will remain at $12, and the number of firms will still be N. In the long run the price will fall to $8, and the number of firms will be less than N.
D) In the short run the price will decrease to $10, and the number of firms will be less than N. In the long run the price will return to $12, and the number of firms will return to N.

ANSWER

A