could anyone give me the step by step explanation thank you!

Consider the queued orders in the following call auction. Buy Sell Price Quantity Quantity $9.07 0 1800 $9.01 0 2200 $8.94 0 2700 $8.92 1700 2800 $8.88 1800 0 $8.86 1600 0 $8.83 900 2000 $8.77 800 0 The call price is determined by first maximising executable volume and then minimising trading surplus. If no more orders are entered, the executable volume at the call would be: a. 2500 b. Other . C. 1600 d. 0 e. 2000