GMAT Sentence Correction (SC) | 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 twenty social action groups.

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