The tendency to act becomes ingrained in us only in proportion to the frequency with which such actions actually occur.

Answer: Option A

Fixed : fastened securely in position.
Marked : having a visible mark or marking.
Destined : (of a person's future) regarded as developing as though according to a pre-existing plan.
Desired : strongly wished for or intended.
Ingrained : (of a habit, belief, or attitude) firmly fixed or established; difficult to change.

Synonym of Ingrained is Fixed