Your Answer is

Correct Answer is C

Explanation

Because 6 is a multiple of 2 and 3, the least common multiple of 1, 2, 3, 4, 5, and 6 is the least common multiple of 4, 5, and 6. Among them, the greatest common factor of 4 and 6 is 2, then the least common multiple of 4, 5 and 6 is 4×5×6÷2=60, so choose C