The answer is A
(don't mind this part)
The correct answer is PARALLELISM
Parallelism refers to a rhetorical device that is used to coordinate ideas, arrange it in sentences, and point out relations. Sometimes, there are similar wordings used to highlight comparisons. In this case, "conscientious" and "conscience" are being paralleled.
Infinitive phrase because infinitives have "to ___" and the blank is an action word ☺