The problem of dowry in our country has assumed gargantuan proportions.

Answer: Option C

Gargantuan : enormous.
Negligible : so small or unimportant as to be not worth considering; insignificant.
Bearable : able to be endured.
Minute : extremely small.
Minimal : of a minimum amount, quantity, or degree; negligible.

Antonym of Gargantuan is Minute