Whistler Company Makes Downhill Skis

Whistler Company makes downhill skis. The company controller wants to calculate the fixed and variable costs associated with janitorial services incurred by the factory. Data for the past six months were collected. Janitorial Labour
Month cost hours
July $9,200 10,120
August 8,800 9,500
September 9,350 10,500
October 9,620 11,100
November 8,400 8,660
December 9,400 10,650
What is the set of high and low months?
High Low

A) July August
B) October November
C) December October
D) December November