HELP ME ASAP The presentation cites studies done by highly reliable sources. For example, Charles Czeisler from Harvard Medical School and the National Sleep Foundation are both cited. What is the purpose of including these sources? Be sure to use information from the presentation to support your answer.

The question is kind of confusing. if it's asking how many variations of answers can you give. then do 4^5 for your answer.this would be something like the first question could be a and the 2nd c or first b next c etc. if you can, ask the teacher for a better confirmation of what it's asking. if i'm assuming correctly what it's asking, it's 625 different variations.

The right answer is option d.