There is no picture for me to know what part is labeled b
Your question is unclear, but I will answer based on what information you have given.
The rectangular prism has a base with an area of 81 meters squared. If the prism’s base is a square, than the dimensions of the object would be 10x9x9.
the ATP synthase complex is located in the inner membrane of mitochondria, with the ATP synthesis reaction occurring on the membrane side toward matrix compartment
c would be the correct answer to this question