you just label the transport of low protein levels
Explanaron:
<span>The Cerebrum: The cerebrum or cortex is the largest part of the human brain, associated with higher brain function such as thought and action. The cerebral cortex is divided into four sections, called "lobes": the frontal lobe, parietal lobe, occipital lobe, and temporal lobe.</span>
I’d say c makes sense , because b is talking about what’s happening not what WILL happen ,
C hope that helps have a good one