Find the one which does not belong to that group ?
Answer: C
8 = 2⊃3;, 27 = 3⊃3;, 64 = 4⊃3;, 125 = 5⊃3; and 343 = 7⊃3;.
8, 27, 125 and 343 are cubes of prime numbers but not 64.