Hi there! The answer is D. kite.
A kite is a quadrilateral with four sides. These four sides can be grouped into two pairs of two sides. The sides in a pair equal in length. The two pairs of angles are adjecent to each other.
An easy way to recognise this mathematical shape is by comparing it to a kite in real life (a kite is a frame covered with paper or plastic, designed to be flown in the air).
~ Hope this helps you!
