(C) $Rigor \text{ } Mortis$ is the post-mortem stiffening of the body's muscles due to chemical changes in the myofibrils. It typically begins in the

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(C) $Rigor \text{ } Mortis$ is the post-mortem stiffening of the body's muscles due to chemical changes in the myofibrils. It typically begins in the smaller muscles of the body. The muscles of the jaw are the first to be affected, followed by the neck, trunk, and finally the limbs.