GWD-20－Q4和Q13

Only seven people this century have been killed by the great white shark,  the man-eater of the movies—less than those killed by bee stings.

1. movies—less than those
2. movies—fewer than have been
3. movies, which is less than those
4. movies, a number lower than the people
5. movies, fewer than the ones

网上没找到解释，选E，为什么D不对呢

Q13:

Like the grassy fields and old pastures that the upland sandpiper needs for feeding and nesting when it returns in May after wintering in the Argentine Pampas, the sandpipers vanishing in the northeastern United States is a result of residential and industrial development and of changes in farming practices.

1. the sandpipers vanishing in the northeastern United States is a result of residential and industrial development and of changes in
2. the bird itself is vanishing in the northeastern United States as a result of residential and industrial development and of changes in
3. that the birds themselves are vanishing in the northeastern United States is due to residential and industrial development and changes to
4. in the northeastern United States, sandpipers’ vanishing is due to residential and industrial development and to changes in
5. in the northeastern United States, the sandpipers’ vanishing, a result of residential and industrial development and changing

选B，这题完全没有解题思路，能否解释一下呢？

like A, B do结构

A 里面动词是 is a result ,牧场 is a result ,不对.

B 里面is vanishing ,牧场在消失