Answer:
Because it had not rained for several months, there was a ...shortage................... of water.
The adjectives are: “good>better>best,” “bad>worse>worst,” “little>littler, less>littlest, least;” “many, some, much>more>most.” The adverbs are: “well>better>best,” “badly>worse>worst.”
I believe it's persuade. You want to persuade schools to offer better food. B is wrong because you are not entertaining anyone. Inform is wrong because you would just be stating facts. A is wrong because you are not telling someone to do something. Hope this helps! ;)