Final answer:
The primary visual cortex is located in the a. occipital lobe, which is responsible for processing visual information.
Step-by-step explanation:
The primary visual cortex is located in the a. occipital lobe of the brain.
The occipital lobe is situated at the very back of the brain and is primarily responsible for processing and interpreting incoming visual information.
The visual cortex is organized retinotopically, which means there is a direct correlation between regions of the visual field and corresponding regions in the cortex.
Therefore, the correct answer to the question is 'a. occipital'.