Answer:
I think it would be lighthearted
Explanation:
None of the other answers really make sense, but if you are allowed a second answer if it is not lighthearted it would probably be serious
Answer:
High school students and medical students
Explanation:
The author points out that medical students, who are about to become some of the most trusted people in the world, are allowed to take open-book exams, so high school students should be able to as well.
BTW, I just did the test, and this was correct.
The word that could fit the gap is definitely a possessive pronoun such as their, used because it refers to the previous pronoun them
C) who reads it.
The audience is determined by the subject, and who reads it is the audience. Hope this helps!