Sarah hurt her back trying to lift her heavy backpack from the ground. what can you tell sarah to her avoid injury when lifting? a. keep your back flat, bend at the hips and knees and use your legs to lift. b. keep you back flat, bend at the hips and use your arms to lift. c. keep your legs straight, bend at the hips with a slight bend in the knees and use your arms to lift. d. keep your shoulders hunched and legs straight, bend at the hips and use your back to lift.