His unscrupulous act would only tantamount to ravage and destruction.

Answer: Option C

Cause : a person or thing that gives rise to an action, phenomenon, or condition.
Result : a thing that is caused or produced by something else; a consequence or outcome.
Equal : being the same in quantity, size, degree, or value.
Repetitious : another term for repetitive.
Tantamount : equivalent in seriousness to; virtually the same as.

Synonym of Tantamount is Equal