When the denominator and numerator are multiplied by the same number, the value of the fraction remains equal. 
Which numbers should be filled in the parentheses to make the equation correct?  $\frac14=\frac{(\textasciitilde\textasciitilde\textasciitilde\textasciitilde)}{16}=\frac8{(\textasciitilde\textasciitilde\textasciitilde\textasciitilde)}$ 

* $4; 20$ 
* $16; 32$ 
* $4; 32$ 
* $4; 40$ 