Which of these accurately describes why an acid is strong?

(a) An acid is strong when it undergoes a reverse reaction.

(b) An acid becomes strong when it is mixed with a base.

(c) An acid's strength is due to the amount present in a solution.

(d) An acid is strong when it dissociates completely in water.

Its c I definitely remember this question

An acid accepts or takes away an electron from a base, it is strong based on how quickly it can do that and how much force it can do that. The dissociation of a strong acid in solution is effectively complete except the most concentrated solutions. So an acid is strong based on the concentration

C my dude, sorry if i'm wrong i'm a bio guy not a physical science guy