The correct answer is its
For future reference it would be more beneficial to give options when asking your questions.
A word which means an excess of or an abundance in supply is surplus.
But I think the answer you ware looking for is surfeit, which is also a synonym with the same meaning!
Hope this helps, if you need anymore help or need further explanation just let me know!! :)
The infinitive phrase 'to keep the children from accidentally falling in the pool' is used as C, an adverb, because its meaning is - for the reason to keep them from falling, and if the meaning is 'reason', it must be an adverbial phrase.
Answer: I think it's Kennedy believes that economic progress for most Americans has been slow, while Nixon believes good progress has been made.