I believe that B is the answer. There are actually multiple disadvantages to using solar energy including the lack of reliablility, the amount of resources needing to be used to create solar panels, and even the lack of energy when there is no sun.
The reduced dependence on fossil fuels is an advantage and the same is involved when it comes to choice C. It is also important for it to become a renewable source so there isn't a lack of needed resources.
Beans, because they contain protein. When it comes to building and repairing, protein is most likely your answer. We know that pasta is not the answer because it is a large source of carbohydrates and most often used for carbo-loading.
