I believe the answer would be C. They allowed for much stronger and more durable weapons.
Answer: "In times like these it is immature — and incidentally, untrue — for anybody to brag that an unprepared America, single-handed, and with one hand tied behind its back, can hold off the whole world.” He is saying this because he believes that the United States may want to manage the hassle by itself but would rather not.
Answer: Candidates would spend way more than the limit in every state.
Explanation: The richest person would most likely win the election because they could spend more on their campaign.