__ fathers are both scientists. (A.Jim's and Bob B.Jim's and Bob's C.Jim and Bob's D.Jim and Bob)

问题描述:

__ fathers are both scientists. (A.Jim's and Bob B.Jim's and Bob's C.Jim and Bob's D.Jim and Bob)

B
因为后面是fathers(复数形式),所以应该是各自拥有的情况