What keeps Pip from accepting Herbert's job offer?

A. Feeling that becoming a clerk is below his station

B. A reluctance to work for Herbert

C. Caring for Magwitch during his illness and trial

D. His pride in being a gentleman

C.

Explanation:

In some way, Pip feels that he can't redeem his relation with Joe. So, the scenario with Magwitch in danger, provides him the opportunity he needs to fix his errors. Because at the end, Magwitch putted his life in danger to see Pip, so Pip can't do less to correspond that.

C. Caring for Magwitch during his illness and trial