hi could i have help with this question please

Emerald Ltd has accumulated the following data for the most recent 6-month period. Month Direct labour hours Maintenance services July 27,000 $46,000 August 20,000 29,000 September 21,000 40,000 October 8,000 17,000 November 12,000 20,000 December 9,000 20,000 Management believes that maintenance cost is a mixed cost that depends on direct labour hours. Using the high-low method to estimate the variable component of this cost, the estimate would be closest to: Select one: O A. $1.56 per direct labour hour O B. $1.53 per direct labour hour O C. $0.69 per direct labour hour O D. $0.66 per direct labour hour