(Figure: Market) Use the Graph to Answer the Question

(Figure: Market) Use the graph to answer the question.
The graph shows the marginal social cost, demand, and supply curves in the jigsaw puzzle market. If market forces prevail, this market will produce and sell _____ units of output at a price of _____.

A) 6; $6
B) 4; $8
C) 6; $8
D) 8; $4