The two fractions are equivalent if a × d = c × b .
A.

⇒ 40 × 5 = 200 and 4 × 50 = 200

⇒ 4× 50 = 5 × 40

B.

⇒ 12 × 5 = 60 and 4 × 15 = 60

⇒ 12 × 5 = 4 × 15

C.

⇒ 16 × 5 = 80 and 20 × 4 = 80

⇒ 16 × 5 = 20 × 4

D.

⇒ 9 × 5 = 45 and 15 × 4 = 60

⇒ 9 × 5 ≠ 15 × 4