The correct answer is A. Cerebrum
Step-by-step explanation:
The motor cortex is an area of the cerebral cortex (outer layer of the cerebrum in the brain), this area is the one responsible for movements especially voluntary ones and including the movement of different parts of the body such as the limbs, the jaw, the tongue, the eyeballs, the neck, etc. Additionally, due to the complexity of the motor cortex, this is divided into three areas located in the same zone that include the primary motor cortex, the supplementary motor area, and the premotor cortex. According to this, it can be concluded the motor cortex is part of the cerebrum as it is located in the cerebral cortex which is part of it (cerebrum).