I'm writing a paper industry about the electric vehicle in U.S market and needs the answer for the following questions?

You need to answer the following questions precisely: A. What are the key determinants of an existing firm's (1) fixed costs and (2) variable costs? Explain your answer. (10%) B. What is the shape of the existing firm's total cost cure and marginal cost curve, U-shaped or L-shaped? A graph illustration here will be a plus