If Buddy's Build a Bear Shop Sells Its Product in a Competitive

If Buddy's Build A Bear Shop sells its product in a competitive market, then

A) the price of that product depends on the quantity of the product that Buddy's Build A Bear Shop produces and sells because the firm's demand curve is downward sloping.
B) Buddy's Build A Bear Shop total cost must be a constant multiple of its quantity of output.
C) Buddy's Build A Bear Shop total revenue must be proportional to its quantity of output.
D) Buddy's Build A Bear Shop total revenue must be equal to its average revenue.