Should a firm shut down if its weekly revenue is $1,000, its variable cost is $800, and its fixed cost is $1,200, of which $450 is avoidable if it shuts down? Why? The firm should O A. shut down because because variable costs are less than fixed costs. O B. produce because revenue is positive. O C. produce because revenue of $1,000 is greater than variable costs. O D. shut down because revenue of $1,000 is less than avoidable costs. O E. shut down because revenue of $1,000 is less than fixed costs