Question

what is the groove indicated by c?

Explanation:

To determine the groove indicated by C, we analyze brain anatomy. The groove (sulcus) between the frontal (red, B) and parietal (blue, C - related area) lobes is the central sulcus (Rolandic sulcus). It separates the frontal lobe (motor areas) from the parietal lobe (sensory areas). By identifying the lobes: B is frontal, the blue region (with C) is parietal, so the groove between them is the central sulcus.

Answer:

The groove indicated by C is the central sulcus (or Rolandic sulcus).