I think its D im not sure hope this helped
Answer: B. Show that light was composed of different colored rays
Explanation:
In the eighteenth century Isaac Newton found out that when a beam of light from the Sun, passes trhough a prism is decomposed in many different colors. He named this phenomenom as dispersion of light.
This phenomenom occurs when a beam of white light (which is compound of many wavelengths or "colors") is refracted (the different rays of light are diverted depending on their wavelengths) in some medium, leaving their constituent colors separated.
<u>B - A theory that stated if Vietnam fell to communism the rest of the region would soon follow.</u>
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People were afraid that once Vietnam fell into communism that surrounded places would soon follow. Vietnam would be the first domino to fall and hit the rest of the region causes more communism.
