If (5⁴)m = 5 ¹²,what is the value of m 2 3 5 8

The correct answer is:  [B]:  " 3 " .

Note:  

The question asks:

If (5⁴)ᵐ  = 5¹² ;  then what is "m" ?

Note the following property of exponents:

   (xᵃ)ᵇ = x⁽ᵃ*ᵇ⁾ ; a≠0 ; b ≠ 0 ;  

Then,  (5⁴)³ = 5⁽⁴ * ³⁾ = 5¹² .

So, "12 ÷ 4 = 3" .

The answer is:  "m = 3" ; which is:  Answer choice:  [B] .