The process of elimination is pretty straightforward. Let's run down the list.

A. In all moderately dim light in which people without the disorder can read large print, people with the disorder cannot read such print.

It does not say that. In fact, it says that people with this disorder have normal sensitivity to most components of dim light.

B. In an otherwise darkened concert hall, these people will see a dimly illuminated red exit sign more clearly than small dim white lights that mark the aisles.

It does not say that. In fact, it says that people with this disorder have normal sensitivity to most components of dim light. There is no reason to suppose that they can see red light better than white light in dim conditions.


C. These people typically see more acutely at night and in dim light than do most people who do not have the disorder.

It does not say that. It says that these people have normal sensitivity to light under dim conditions, not extra sensitivity.

D. Eyeglasses that are transparent to red components of light but filter out other components of light help these people see in moderately bright light.

This is the credited response. Since people with the disorder can see red light normally, glasses that filter out non-red light can help them to see under bright conditions.

E. These people perceive colors other than red in the same way as do most people who do not have the disorder.

It does not say that. We have no information to conclude that. It merely says that they have normal sensitivity to most components. Most does not mean all.