The retina is a term to refer to the layer of tissue that is behind the eyeball, it is sensitive to light, so it is known as a photoreceptor due to the specialized cells located on it that are known as cones and rods as wells as neurons. Through these, the images that pass through the lens of the eye are focused and become nervous signals; these nerve signals travel through the nervous system and reach the brain's neurons where they are processed. This tissue is mainly red, because of the blood vessels around it. So, the correct answer is B. Retina.
I would assume it works the same way as a regular debate... So a debate introduction would include you opinion (or assigned side of the debate) of the topic, such as the pros or cons of the topic (biology).
Explanation: if it takes 5 minutes to reach a station, just add 5 to the amount of minutes you already have (23) to get 28. And the hour and seconds stay the same.