Data Sufficiency

If the operation D is one of the four arithmetic operations addition, subtraction, multiplication and division, is (6 D 2) D 4 = 6 D (2 D 4)

1. 3 D 2 >3
2. 3 D 1 = 3

Ans = A

I am getting C and here is how I have solved it
From 1 D can be either + or X (because 3 +2 >3 and 3 X 2>3) - not sufficient

From 2 D can be either division or X - Insufficient

Combining the 2, multiplication satisfies both 1 and 2, so C

If the operation D is one of the four arithmetic operations addition, subtraction, multiplication and division, is (6 D 2) D 4 = 6 D (2 D 4)

1. 3 D 2 >3
2. 3 D 1 = 3

3D2>3 ; so d is clearly either multiplication or addition
If D is addition the (6+2)+4 = 6+(2+4)
If D is multiplication then (6*2)*4 = 6*(2*4)
Hence A is sufficient

Statement II
D can be either division or multiplication
If D is multiplication the (6*2)*4 = 6*(2*4)
However if D is division then (6/2)/4 is not equal to 6/(2/4)

Hence insufficient

So A