Answer : option C
A. 4 × (5 + 2) = 28
Associative property of multiplication . Here we have 5+2 so it does not comes under Associative property of multiplication
B. 4 + (9 × 4) = 40
Here we have 4 + . there is a + sign inbetween. so it does not comes under Associative property of multiplication
C. 4 × (5 × 2) = 40
Here we have 4 times 5 times 2. so it comes under Associative property of multiplication
D. (4 + 5) × 2 = 18
Here we have 4 + 5 so it does not comes under Associative property of multiplication