There are three layers of neurons in the retina the innermost (i. e., towards the inside of the eye) layer is "made up of which cells"?
a. cone cells
b. bipolar cells
c. ganglion cells
d. rod cells

Option C  

Explanation:

The ganglion cells are located in the inner most nucleated layer of the retina which is situated between the nerve fiber and inner plexiform layer of the eyes.

The optic nerve contains over 1.3 million nerves which originates in the retina and connects the eyes to the brain.

These cells are responsible for carrying the information from the eyes to the brain and from the brain to the eyes.

The innermost layer is the gaglion cells and then comes the bipolar cells just next to the ganglion cells.

the answer is:

carbon dioxide