Which scale factors produce a contraction under a dilation of the original image? choose two answers.
a. -1.8
b. -0.8
c. 1.8
d. 0.8

A dilation occurs when the scale is greater than 1 from the center of the dilation.  When the scale is less than 1 from the center it is a contraction.  Since distance from center can be positive or negative, the contraction will occur with a scale factor of

B. -0.8  and
D. 0.8

The answer to your question is b