Read the excerpt from "Homesick." “Why should I?” I asked. “Americans haven’t said that since George the Third.” He grabbed my right arm and twisted it behind my back. “Say it,” he hissed. I felt the tears come to my eyes and I hated myself for the tears. I hated myself for not staying in Rome the way my mother had told me. What is the tone of the excerpt from "Homesick?" Question 5 options: A. Frustration
B. Mysterious
C. Cautious
D. Humorous

The tone of the excerpt ‘Homesick’ is A. Frustration.

Hello!

The correct answer is: We students are participating in a meeting at the end of the school day. 

An easy way to tell if a sentences uses "we" or "us" is to remove the subject (students, in this sentence) and see which word works correctly. 
In this case, it would either be "we are participating in a meeting at the end of the school day." Or "Us are participating in a meeting at the end of the school day."

By doing this, you are able to see which word works correctly with the sentence. 

I hope this helps answer your question! Have a great day!