I have only 5 minutes to answer, this no explanation needed just choose correct answer

Zelda Corporation had the following high and low costs for 2019: December had $20,000 in costs for 3,000 units; May had $10,000 in costs for 1,000 units. Using the high low method, Indicate the fixed costs: Multiple Choice $15.000 $10,000 $40.000 O $5,000