please answer all the question.

Question 12 The following six months of data were collected on maintenance cost and the number of machine hours in a factory: MONTH July August September October November December MAINTENANCE COST $16,900 13,900 10,900 11,500 13,000 17,900 MACHINE HOURS 5,600 4,500 3,800 3,600 4,200 4,500 Select the correct set of High and Low months from the following combinations in order to use the High-Low method to separate mix costs: B. c. D. High July July December December Low October September September October