The surface area of the pyramid is 122.2 square yards. Then the correct option is A.
What is Geometry?
It deals with the size of geometry, region, and density of the different forms both 2D and 3D.
The surface area of the pyramid is given as
[tex]\rm Surface \ area = 4\times \dfrac{1}{2} \times base \times height\\\\Surface \ area = 4\times \dfrac{1}{2} \times 8.4 \times 4.2 \cos 60^o\\\\Surface \ area = 122.2 \ square\ yard[/tex]
More about the geometry link is given below.
https://brainly.com/question/7558603
