Lisa has been assigned to write an expository paper about a topic that interests her personally. Lisa has chosen to write a paper that explains why students should be allowed to have cell phones at school. Which of the following is the best thesis for Lisa's paper?

a
Students should have the right to have cell phones at school because they are important to student safety.
b
My best friend's $200 cell phone was taken away from her because she was using it between classes in the hall.
c
Some, but not all, students misuse their cell phones by texting each other the answers to exam questions.
d
There are a lot of high-tech cell phones that include features like cameras, mp3 players, Internet access, and GPS.