(While) smoking was associated with an attention of weight gain among black adults, (no such effect) occurred among white men or women, the latter (was) the group (most likely) to smoke for weight control.

A．explained
B．forwarded
C．prepared
D．presented

A．1) most probably means ______.A. betray each otherB. harm one anotherC. help to collaborate with each otherD. benefit one another