Question

Determine whether or not the polygons are similar and why.

A.Yes; All parallelograms are similar
B.No; corresponding angles are congruent, but the ratio of corresponding side lengths is known
C.No; the measures of corresponding angles are unknown
D. Yes; corresponding angles and side lengths are congruent

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Answer 1

I think your choice B is incorrect.
The last word should be "unknown", not "known".

Answer 2

What is the definition of congruent polygons?

Each angle of one polygon must be congruent to each corresponding angle of the other polygon.
The ratios of the lengths of corresponding sides must be equal.

Answer 3

Check if you have both conditions above.