The product of three consecutive integers must be
Ⅰ.Divisible by 3
Ⅱ.Divisible by 5
Ⅲ.Divisible by 6
A．Ⅰ only
B．Ⅱ only
C．Ⅰand Ⅱ only
D．Ⅰ and Ⅲ only
E．Ⅰ, Ⅱ, and Ⅲ