Answer: A
Explanation:
We use process of elimination.
A rectangle has all right angles so A is a possibility.
The two base angles of a rectangle are NOT different angle measures so B is out of the question.
The sum of all the angles (90+90+90+90) is 360, not 180, so C is wrong.
All the angles of a rectangle are the same, so D is incorrect.
That means that A has to be correct!