Correct Answer: C
Explanation:
Option A and D can be easily eliminated, since 2 and 8 never comes in units place in 4x.
If you see pattern (4 x 4 = 42 = 16 i.e. 42x = 6 at units place) and (4 x 4 x 4 = 43 = 64 i.e. 42x+1 = 4 at units place). Similarly, 464 = 6.