For which service business is job order costing the appropriate costing method to use?

a. A law practice that serves a variety of customers having differing levels of legal needs and requirements.

b. An income tax preparation accounting practice preparing individual income tax returns for clients have an income less than $50,000.

c. A farm feeding, raising, and sending many rabbits to a wholesaler for domestic resale purposes.

d. An oil fracking company extracting oil from a variety of oil fields leased to the company by a state.