Final answer:
To properly perform the drawing-in maneuver, the appropriate cue is to hollow the lower back by pulling the navel towards the spine, engaging the transverse abdominis muscle.
Step-by-step explanation:
An appropriate cue that can be given to a client to properly perform the drawing-in maneuver is C) Hollow the lower back. This technique involves pulling the navel in towards the spine, which engages the transverse abdominis muscle, a key stabilizer of the lumbar spine and core. In contrast, Arch the lower back and Push the abdomen out would not correctly engage the core muscles for this maneuver, while Tighten the glutes might support the movement but does not directly relate to the drawing-in of the abdomen.