Its clear that neither he nor his parents the plan put forward at the family meeting.A. a

问题补充：

Its clear that neither he nor his parents the plan put forward at the family meeting.

A. agrees to

B. are for

C. is in favor of

D. agree on

答案：

A. agrees to

(答案→)B. are for

C. is in favor of

D. agree on

解析：neither...nor连接两个并列的主语时，谓语采用靠近原则，所以谓语的数应由his parents来决定。因为his parents是复数，所以agrees to和is in favor of都可以排除；agree on的主语必须是达成共识的人们或者单位，故答案只能选B项。