I won't give the answer because I think its too much responsibility for me but I can help
first population increase won't really be the answer its a war people are getting killed how would the population increase so B isn't the answer
for C. Abundance of food the word Abundance is very large quantity in this choice they're saying that they have soo much food which is incorrect there were probably bombs a and stuff
so A should be the correct answer
I explained everything so u should know which choice to pick especially since u know ur lessons better than I do