一个关于逻辑的问题(OG12-124)

124. Found throughout Central and South America, the sloth hangs from trees by its long rubbery limbs, sleeping 15 hours a day and moving so Infrequently that two species of algae grow on its coat and between its toes. (这是正确的句子）


(C) sloths use their long rubbery limbs to hang from trees, sleep 15 hours a day, and move so infrequently

我的疑问在于选项C的官方解释：
Sloths does not agree with its; this structure says that sloths use their long rubbery limbs to … sleep.

‘Sloths does not agree with its’这点没有问题，但是后面的我就不明白了，因为如果把选项改为：
limbs to hang from trees and sleep 15 hours a day 这样的确有 use their long rubbery limbs to … sleep的意思，但是按照选项C的结构use, sleep, and move是一个平行结构（虽然这样的平行不合逻辑），这样的结构怎么会有use their long rubbery limbs to … sleep的意思呢？

求指点

sloths use their long rubbery limbs to hang from trees, （to）sleep 15 hours a day, and (to) move so infrequently
分析并列的时候，看是否有和最近的成分并列的歧义。然后再往稍远点的地方找。 这个和比较(平行的一种)是一样的，例如A do B as c. 一般先考虑B和C并列是否make sense.