Which of the Following Provides Support for the Idea That

Which of the following provides support for the idea that the afternoon decrease in alertness experienced by people is a result of an ultradian rhythm?

A) This decrease in afternoon alertness occurs in night-shift workers as well as daytime workers.
B) This decrease in afternoon alertness lasts for more than 2 hours.
C) This decrease in afternoon alertness is still seen in people who skip lunch.
D) This decrease in afternoon alertness can be corrected with bright light exposure.