Which Action by the Patient Indicates Appropriate Use of the Walker

Which action by the patient indicates appropriate use of the walker?

A) The patient leans over the walker when rising to a standing position.
B) The patient's elbows are bent at a 45-degree angle when holding onto the walker.
C) The patient ensures that the walker is locked in the open position before using it.
D) The patient looks down at the walker when walking to keep from kicking it.