Answer:
C. Humans have been on Earth for a very short amount of time
Explanation:
using process of elimination, insects were around before dinosaurs were so that takes away B and C, then humans have been on earth for around 200,000 years which definitely isn't hundred of millions so it's most likely C
The answer is A they worked long hours and had low pay.
One positive is it helped the countries against communism by supplying them with weapons. A negative is that the countries against it could have been impostures and used the weapons we gave them against us
