Question

function of the primary motor cortex
the primary motor cortex of the right cerebral hemisphere ______________.
controls the motor activity on the right side of the body
controls the motor activity on the left side of the body
receives and processes sensory input
integrates senses from multiple different sources

Explanation:

The primary motor cortex of one cerebral hemisphere controls the motor activity on the opposite side of the body due to the crossing - over of neural pathways (decussation). The primary motor cortex is responsible for motor control, not sensory input (that's the primary sensory cortex) or integrating multiple senses (association areas).

Answer:

controls the motor activity on the left side of the body