单项选择题

M: Hi, Alice, It’s Jim speaking.
W: Hi, Jim. What’s up
M: I’m calling about the machines. Have you installed them
W: Yes. We finished installing them last week.
M: When will you start testing the machine
W: Next Monday.
M: How long will it take
W: About three weeks.
M: Good! Keep us informed.
W: We will. Bye!

What are they going to do next()

A. Install more machines.
B. Test the machines.
C. Buy more machines.
D. Sell the machines.