The client only completes 6 out of 10 reps that means the percentage of the max lifted for her is 85%. Take the weight lifted (85 pounds) and divide it by the percentage of completed lifts which is (85%) 85 / 0.85 = 100
Her estimated 1RM = 100
When the head rotates or tilts, the otoliths in the vestibule sacs shifts, causing the fluid in the semicircular canals to move, bending hair cells, which turn in activate neural signals and notify them about the head's position and movement. The vestibule nerve connects with the cochlear nerve to form the auditory nerve, which relays information to the brain about balance.
Based on how the question is asked I would say 2 3 are main answers but # is a possible answer if a third option is required.