I could achieve success through conscious efforts.

Answer: Option B

Gain : obtain or secure (something wanted or desirable).
Aware : having knowledge or perception of a situation or fact.
Desire : a strong feeling of wanting to have something or wishing for something to happen.
Tremendous : very great in amount, scale, or intensity.
Conscious : aware of and responding to one's surroundings.

Synonym of Conscious is Aware