In given picture we see that there are total 8 boxes out of which only 5 are shaded.
So the number that represents shaded part will be 5/8.
But we have to find which choice doesn't indicate shaded part.
So we will pick those choices which are not equivalent to 5/8.
5/8=0.625
if you convert that into percent then we get (5/8)100%=62 1/2 %
that means 5/8, 0.625, 62 1/2 % all represents same thing and represent shaded part.
So the remaining choice a) 0.582 is the final answer .