Final answer:
"I gnashed my Teeth and ground them together, uttering a groan that came from my inmost soul."
The answer is A. Teeth.
Step-by-step explanation:
In the given passage, the author describes the act of gnashing and grinding the teeth together while uttering a groan. This description indicates that the teeth are the specific body part involved in this action.
Gnashing and grinding of teeth often occur as a physical manifestation of frustration, pain, or anger. It involves forcefully rubbing the upper and lower teeth together, resulting in a grinding sound.
Teeth are the hard, calcified structures located in the mouths of humans and many other animals. They play a crucial role in the process of chewing and breaking down food, as well as in speech.
The answer is A. Teeth.