GMAT Sentence Correction (SC) | Re: Though initially opposed to the measure, the governor

Though initially opposed to the measure, the governor approved the new needle exchange programat the urging of his own doctor, his chief advisers, and a coalition of some 20 social action groups.

a) at the urging of his own doctor, his chief advisers, and a coalition of
b) as a consequence of having been urged by his own doctor, his advisers, and a coalition of
c) on account of being urged by his own doctor, chief advisers, and a coalition of
d) as he was urged to do by his own doctor, his chief