Without the lap belt, your body will simply pivot around the shoulder restraint and continue forward

this is true. the lap belt keeps you tight against the seat.

The correct answer for above statement is:

The lap belt and shoulder belt are fastened over the pelvis and rib cage, which are quite able to resist crash forces than other portions of your body. Put the shoulder belt over the middle of your heart and away from your neck. The lap belt holds over your hips.It holds your body and enables you to not tilt forward it is safety precautions.

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