Verano Inc. has two business divisions a software product line and a waste water clean-up product line. The software business has a cost of equity capital of 10% and the waste water clean-up business has a cost of equity capital of 7%. Verano has 50% of its revenue from software and the rest from the waste water business. Verano is considering a purchase of another company in the waste water business using equity financing. What is the appropriate cost of capital to evaluate the business?

A. 7% B. 9% C. 10% D. 8.5%