请问这题的正确答案是什么，为什么？多谢

GWD-17-Q34

During the month of May, crabs arrive on Delaware’s beaches to lay eggs.  Certain shorebirds depend on these eggs for food during their annual spring migration to their northern breeding grounds.  Delaware’s crab population has declined recently.  This decline, however, poses no serious threat to the migrating shorebird populations:  by remaining longer in Delaware, the birds will be able to eat enough crab eggs to allow them to complete their migration.

Which of the following, if true, most seriously weakens the argument?

  crab的数量减少了，但是鸟儿的解决方案是remaining longer(停留在海滩上多些时日）多到enough，就能complete their migration了。要削弱它，最直接的切入点就是remaining longer，肯定也带来了坏处。  读完题大致就想到这里了，然后我是直接奔跟remain时间有关的选项去的，就是E（E的话外音就是如果去晚了(在crab的海滩上remain太久)，很可能会造成breed unsuccessfully）,果然E就是正确答案！

  crab的数量减少了，但是鸟儿的解决方案是remaining longer(停留在海滩上多些时日）多到enough，就能complete their migration了。要削弱它，最直接的切入点就是remaining longer，肯定也带来了坏处。  读完题大致就想到这里了，然后我是直接奔跟remain时间有关的选项去的，就是E（E的话外音就是如果去晚了(在crab的海滩上remain太久)，很可能会造成breed unsuccessfully）,果然E就是正确答案！

  crab的数量减少了，但是鸟儿的解决方案是remaining longer(停留在海滩上多些时日）吃到enough，就能complete their migration了。要削弱它，最直接的切入点就是remaining longer，肯定也带来了坏处。  读完题大致就想到这里了，然后我是直接奔跟remain时间有关的选项去的，就是E（E的话外音就是如果去晚了(在crab的海滩上remain太久)，很可能会造成breed unsuccessfully）,果然E就是正确答案！

A.      No other food available to the birds on Delaware’s beaches is as nutritious and accessible as are crab eggs.

B.       The decline in the number of crabs on Delaware’s beaches is due to the harvesting of crabs by humans.

C.       There are more crabs on Delaware’s beaches than in any other area that the migrating birds pass through.

D.      The crabs do not conceal their eggs.

E.       The earlier in the season the shorebirds complete their migration, the more likely they are to breed successfully.