Sarah, a hospital administrator, is required to sit for prolonged hours and work on a computer. At the end of the day, she often has pain in her back and shoulders. How can Sarah sit properly using the principles of body mechanics?

A.
by sitting forward in her chair and lowering her shoulders
B.
by keeping her legs crossed and her shoulders lowered
C.
by raising the chair’s height so only her toes touch the floor
D.
by keeping her back, arms, and feet supported
E.
by bending forward to sit closer to the computer