看了老帖还是不明白，求大神指教！！

richygogogo

Starfish, with anywhere from five to eight arms, have a strong regenerative ability, and if one arm is lost it quickly replaces it, sometimes by the animal overcompensating and growing an extra one or two.

A one arm is lost it quickly replaces it, sometimes by the animal overcompensating and
B one arm is lost it is quickly replaced, with the animal sometimes overcompensating and
C they lose one arm they quickly replace it, sometimes by the animal overcompensating,
D they lose one arm they are quickly replaced, with the animal sometimes overcompensating,
E they lose one arm it is quickly replaced, sometimes with the animal overcompensating
这里的B为什么对，C为什么错？in general, "COMMA + prep phrase modifier" is an adverbial modifier, meaning that it modifies the entirety of the preceding clause.如果把C改为they lose one arm they quickly replace it, sometimes by the animal overcompensating and这样子是不是就正确了？？