Sonia Opened a Yoga Studio Where She Teaches Classes and Sells

Multiple Choice

Sonia opened a yoga studio where she teaches classes and sells yoga clothing. Variable costs for Sonia's yoga studio include the cost of the (i)
Tank tops.
(ii)
Wages paid to the other yoga instructors.
(iii)
Lease on the studio space.(iv)
Insurance that the landlord requires Sonia to carry for the studio.

A) (i) only
B) (i) and (ii) only
C) (iii) and (iv) only
D) (i) , (ii) , (iii) , and (iv)