If you can solve this correctly you get 20 points

The greatest common factor is 30

The greatest common factor (GCF) is the highest possible number that divides into all the given numbers, so you're looking for a number that divides into 90, 30xy^2, and 60xy. 30 divides into all three numbers to give you 30, xy^2, and 20xy, and you can't get any lower than that, so 30 is your answer.

Letter a i would say