2. At the fish market, a banner hangs that reads "Today's 50% off offer: one-pound packs of fish, half packs only 3 yuan." Then the regular full price per pound of fish is ( ) yuan.
(A)6
(B) 9
(C) 10
(D) 12
(E) 15
2. D.

From the problem, we know that half a pack of fish, which is one pound, is 3 yuan after a 50% discount. Therefore, the full pack of fish at 50% off is 6 yuan.
Thus, the regular price per pound of fish is 12 yuan.