Correct Answer: A
Explanation:
The fastidious (the meticulous, people careful about every detail) shun vulgarity; the vacillating (indecisive) shun action.
| Vacillating: | wavering or tending to waver in motion, opinion, etc |
| Mob: | a disorderly and lawless crowd; rabble |
| Bourgeois: | a self-employed person, as a shopkeeper or businessman |
| Onerous: | burdensome; laborious |