Horseplay or practical jokes

a. are permitted if no one is insulted
b. may be done during breaks or study time
c. cause accidents and have no place in the lab
d. usually do not result in accidents

Well for school purposes it would be c) cause accidents and have no place in the lab

Hope this helps :)

at school this would be c, if you are outside or in a place without chemicals and other things like burners it would be a

exposure to hazardous carcinogens and toxic substances can cause breathing problems, such as copd and various types of cancer. it also increases the risk of heart attacks and strokes and has serious (but no less unattractive) side effects, such as aging, yellow teeth, a terrible smell and damage to the vocal cords.