Alford, Brooks, and Fitch Companies Below Are Income Statements That

Alford, Brooks, and Fitch Companies Below are income statements that apply to three companies: Alford, Brooks, and Fitch:
Refer to Alford, Brooks, and Fitch Companies. Within the relevant range, if sales go up by $1 for each firm, which firm will experience the greatest increase in profit?

A) Alpha Company
B) Beta Company
C) Fitch Company
D) can't be determined from the information given