6513. His unscrupulous act would only tantamount to ravage and destruction.

✅ The correct answer is 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