His unscrupulous act would only tantamount to ravage and destruction.

The correct answer is: C. equal

The word “tantamount” means “equivalent in effect or significance.” In this sentence, the unscrupulous act is being described as being equal to ravage and destruction.

The other options are incorrect because:

• A. cause is incorrect because the unscrupulous act is not being described as causing ravage and destruction.
• B. result is incorrect because the unscrupulous act is not being described as resulting in ravage
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  and destruction.
• D. repetitious is incorrect because the unscrupulous act is not being described as being repetitious.

I hope this helps!