AIBS's is composed of ______.
A.more than 80 societies and 250,000 members
B.250,000 biologists
C.80 member organizations
D.more than 250,000 members and 80 member societies

A.A.more
B.250,000
C.80
D.more

【参考答案】

A
解析：第三段的最后一句提供了答案。