Figure 56.2 . Altruism Involves ____, but Reciprocal Altruism Involves ____. ​

 
Figure 56.2 .
Altruism involves ____, but reciprocal altruism involves ____. ​

A) the sacrifice of an individual's reproductive success to help others; the expectation of a future favor in return for present aid
B) aid given to nonrelatives; benefits given to close relatives only ​
C) the expectation of a future favor in return for present aid; close relatives helping each other ​
D) low-risk behavior that provides minor benefits to others; high-risk behavior providing major benefits to others ​
E) aid given to relatives; benefits given to nonrelatives only ​