As we have no clue about the values of a and b. And we just know that a and b are integers, options A,B,D, and E cannot be determined.

Only option C is possible here because:

3^5*a= 5^3*b

a= 5^3*b/3^5

The right hand side must be an integer as a is an integer. Thus b carries at least 3^5.

Bunuel when the OA is released, please let me know if this method is correct.

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