GWD3-36题，有一句话不明白，请求NN指点！

Q36:我已经看过了前辈们的讨论但是对于 the least common multiple这句话不理解，请求指点！

If M is the least common multiple of 90, 196, and 300, which of the following is NOT a factor of M?

A.    600

B.     700

C.     900

D.    2,100

E.     4,900

是最小公倍数的意思

感谢NN!