GWD6-Q11 怎么没有人讨论这一道题，为什么选D, 不选E

 Further-

more, the daily movements of sloth

 (20)      bears and American black bears—

       which are similar in size to sloth bears

       and have similar-sized home ranges—

reveal similar travel rates and distances,

suggesting that if black bear cubs are

 (25)      able to keep up with their mother, so

too should sloth bear cubs.

Q 11. Which of the following, if true, would most weaken the author’s argument in lines 18-26 (“Furthermore … sloth bear cubs”)?

1. Cub-carrying behavior has been observed in many non-myrmecophagous mammals.
2. Many of the largest myrmecophagous mammals do not typically exhibit cub-carrying behavior.
3. Some sloth bears have home ranges that are smaller in size than the average home ranges of black bears.
4. The locomotion of black bears is significantly more efficient than the locomotion of sloth bears.
5. The habitat of black bears consists of terrain that is significantly more varied than that of the habitat of sloth bears.

I am also selecting E, but now think D is better.

Reason: pls notice "furthmore",which is following by "However". So these two examples are to oppose "one explanation is that.....since myrmecophagy entails a low metaboic rate and high energy expenditure....". Therefore, if locomotion of black bears is more efficient, the conclusion will be weakened.