Muskrats generally ( )close to the edge of a bog ,where their favorite plant foods grow plentfully.A stay B to stay there C staying D they are stayinggenerally doing sth,有这个用法吗?

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Muskrats generally ( )close to the edge of a bog ,where their favorite plant foods grow plentfully.
A stay
B to stay there
C staying
D they are staying
generally doing sth,有这个用法吗?

填谓语
只有A能
不能用doing ,这样没有谓语

A
before doing must have is or are