[The Following Information Applies to the Questions Displayed Below

[The following information applies to the questions displayed below.]
The monthly high and low levels of direct labor hours and of total manufacturing overhead for Onyx Company are as shown:

-On the basis of the above data,the cost formula for Onyx's monthly manufacturing overhead can be expressed as:

A) $18.00 average cost per direct labor hour.
B) $1.80 average cost per direct labor hour.
C) $26,000 fixed cost plus $1.50 per direct labor hour.
D) $18,000 fixed cost plus $2.00 per direct labor hour.