The reason why "good vs. evil" is a universal theme is because there are always two forces at work one for good and one for evil and for every good/evil thing there is an evil/good thing that will go up against each other until the end of time or at least until one of them is defeated, but then another good/evil thing will appear to take it place.
Example 1:
Your in high school and there is a bully and you try to stop the bully from hurting others. This makes you the good force and the bully the evil force (he/she doesn't have to be "evil" per-say just bad or mean will do).
Uttering words in a low tone. Like if talking by to themselves.
The Answer is (B) with understanding
Answer:
=students should enter the exam hall by 10 am
=students should bring admit card in order to give their exam paper
= no one is allowed to talk and should maintain silence in the exam hall
= student are not allowed to talk to the invigilator rudely
= students are not allowed to leave the hall before one hour
I think it's the 3rd one. Might be wrong though.