Marta was in an automobile accident and suffered an injury to her brain, resulting in the paralysis of her left arm. what part of marta's brain was injured?

The correct answer is the motor cortex association.

Explanation:

The motor cortex refers to a component of telencephalon that in turn is the component of the brain. Its prime activity is to encourage movement. With the help of this one can produce, sustain, and complete the movements.  

With the help of the motor cortex, one can produce voluntary movements deliberately. This part of the brain is situated in the frontal lobe, just in the anterior part of the somatosensory region and Rolando's fissure.  

If the section of the brain, where the motor cortex is present get injured, then the movement of certain parts of the body may get restricted or may even get lost. Due to this, if Marta lost her movements of the arm after suffering a brain injury due to an accident, it can be concluded that the accident incapacitated the motor cortex region.  

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