Final answer:
The market supply of nachos cannot be determined without specific information about the quantities supplied by the two firms at the given price.
Step-by-step explanation:
The question is asking about the market supply of nachos when the price is $6, assuming there are only two suppliers: Firm 1 and Firm 2. To find the market supply, we need to add the quantities supplied by both firms at that price. Without the specific information about the quantities supplied by each firm at that price, we cannot determine the exact market supply. Therefore, we cannot choose any of the options provided in the multiple-choice question.