Maintenance costs at Seaside Manufacturing over the past six months are listed in the following table. Month January February March April May June Maintenance cost $13,600 $14,720 $12,460 $14,480 $15,380 $13,200 Machine hours 15,500 16,900 13,700 16,600 17,400 15,000 Using the high-low method, what would the variable maintenance cost per machine hour be? O A. $0.88 OB. $0.91 OC. $0.79 OD. $1.27