PLEASE HELP ME! PLEASE!!

Which scale factors produce an expansion under a dilation of he original image?

Choose all answers that are correct.

a)-0.75
b)-2
c)0.75
d)2

Which scale factors produce a contraction under a dilation of he original image?

Choose all answers that are correct.

a)-1.8
b)-0.8
c)1.8
d)0.8