(D) 9/15
All the options given in the question are further simplified as,
(A) 40/50 = 4/5
(B) 12/15
Divide both numerator and denominator by 3.
= 4/5
(C) 16/20
Divide both numerator and denominator by 4.
= 4/5
(D) 9/15
Divide both numerator and denominator by 3.
= 3/5
Therefore, 3/5 ≠ 4/5