I think it is C (meiosis)
The fact that it's a renewable resource would be the only benefit. All of the others are disadvantages
Most organisms either directly or indirectly use energy from the sun to survive, but not all of them. Plants and some microbes use the energy from the sun to perform photosynthesis.
The answer to your question 12
DNA profiles from a crime scene can be entered into CODIS. Therefore, law enforcement officers have the ability to identify possible suspects when no prior suspect existed. This is the best i can do, I dont know about exactly "at home" tests.