A company observed a decrease in the cost per unit. All other things being equal, which of the following is most likely true? Multiple Choice 0 The company is studying a variable cost, and total volume has increased. ) The company is studying a variable cost, and total volume has decreased. 0 The company is studying a fixed cost, and total volume has increased ) The company is studying a fixed cost, and total volume has decreased. C) The company is studying a fixed cost, and total volume has remained constant