Is 300 a factor of Q?

If 300 is a Factor of Q, then Q should be 300,600,900....etc

Hence Required Set = {300,600,900.....}

1.250 is a Multiple of Q

Q can be 1,2,5,10,........250
Q cannot exceed 250 because there cannot be a multiple less than the given number.
for exaple: 10 cannot have a multiple less than 10.

Hence this Set doesnot have any common elements with the required Set.

Therefore, 300 cannot be a factor of Q.
SUFF

2.250 is a Factor of Q
Q can be 250,500,750,1000,1250,1500...

This set will match the required Set if Q = 1500
It will not match the required set if Q = 250.

Hence INSUFF

pick A.

Hope this helps!!