A
Adjust to the center of the pillow against the neck.
B
Adjust to align the center of the pillow with the neck.
C
Adjust to the center of the headrest higher than the top of the head.
D
Adjust to the center of the pillow to support the head.
✓
ANSWER · D
The main function of the safety headrest is to effectively protect the cervical spine of driver and passengers in a rear-end collision. When adjusting the height, keep the center of the headrest level with the center of the back of the head to provide protection. So the answer is "adjust to the center of the headrest to support the head".
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