If x is an even number, which one of the following is an odd number? I. (3x+1) II. (5x2 + 2) III. (x + 1)2

If x is an even number, which one of the following is an odd number? I. (3x+1) II. (5x²+ 2) III. (x + 1)²

A I only

B III only

C I and II only

D I and III only

Correct Answer: Option D

suppose, x =2 then , i)3.2+1=7 ii)5(2)2 +2=22 iii)(2+1)2 =9