I would say A. Because c and d r very dangerous if u think about it. And b is right in some situations. But if u do a then people can see whts going on if something happened because of the light. and it is safe. If wrong let me know. :D
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You didn't give options, but I would say either rat guts, animal fecal matter, or bugs.
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Improve staff morale
Prevent the spread of infection and disease.
B and C I believe
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then just close your eyes or start reading something or drink a cup of coffee
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After lifting weights for two weeks, Joe finds that the weights he has been lifting do not feel very heavy to him anymore. This is an example of Muscle adaptation principle - D.