I would say b and c, since unfasten and clench are basically antonyms and those answers both have antonyms
There are two main ideas for each passage, in the first one it mentions the positive outcomes of having a pet in class; it can help children with health problems and nervousness in students will decrease. In this sentences it supports the idea of a pet in class, saying the positive results of it and how it helps or it will help children.
In the second passage it mentions the negative outcomes of having a pet in class; they will make some health problems worst and the nervousness in students will increase around them. These two ideas are against the possibility of having a pet in class, mentioning how it will affect students instead of helping them.
What makes these two passages different is the opinion towards one main idea: pets in class. One passage supports it and one is against it.
The answer to this question will be B
It's when following historical cases with identical being approached the same way unless overlooked in the court
