I think it is possibly A or C if eliminating answers helps you.
The answer is:
Worked hard to take care of their patients.
I believe the answer is A The strongest effect on his literacy is the light it cast on the world he already knows.
Hope that helps you.
In my opinion, the pat that suggests a trace of human feeling in Mr. Bumble's character is the following one: "<span>Mr. Bumble regarded Oliver's piteous and helpless look, with some astonishment, for a few seconds; hemmed three or four times in a husky manner; and after muttering something about 'that troublesome cough,' bade Oliver dry his eyes and be a good boy." Even though he has treated Oliver cruelly and severely, when he sees Oliver's distress, Mr. Bumble seems to feel some compassion for a moment.</span>
