As pointed out in the text, "reciprocal altruism theory" and "strong reciprocity theory" are ______.

A．Prada is in a desperate situation.
B．Prada is notorious for her hasty execution.
C．Prada is always in her bad habit.
D．Prada is too much engaged in her work.

A．Opening new stores, on the horizon.
B．More ventures bring more rewards.
C．Tight the belt, the single remedy.
D．Not every cloud has silver linings.