Phil is placing a large order for office furniture for a repeat client. He has selected some ergonomic chairs, solid wood desks, and some stain- resistant rugs. Why is it important that Phil chose ergonomic chairs?

A. The office workers will spend long periods of time sitting in them.
B. They will be appropriately colored for a formal office.
C. They were designed by the same designer that created the desks.
D. They are easier to buy in bulk.