I think it is D because in every paragraph you need 2 details about your topic
1. I am an astronaut because I float in space and look at earth 2.I am a princess because my father has a crown and I have to wear a dress 3.I am a baseball player because I swung with a bat and there is a pitcher 4.I am an artist because I have a canvas and brushes 5.I am a mechanic because I sell parts of things to people
As per convention:
- the angle at A is named A, the angle at B is named B, and the angle at C is named C
- the side of leght a is the side opposed to A, the side of length b is opposed to B, and the side of length c is opposed to C.
Now just state the law of cosines:
c^2 = a^2 + b^2 - 2ab cos(C)
Also, a^2 = c^2 + b^2 - 2bc cos (A)
And, b^2 = a^2 + c^2 - 2ac cos (B)