B isn’t the correct answer
People used the telegraph to send messages via Morse Code. Which was a variation of taps on a small pad sending electronic pulses that would make a beeping sound. There would be someone on the other end that would listen to the pulses and write them down into words
This plan is known as the Open Door Policy.
This idea was introduced by Secretary of State John Hays in 1899. The goal of this plan was to ensure that all nations had the ability to trade with China. Even though this plan referred to the ability of all nations to trade with China, the real reason behind its development was the fear of the US government being blocked out of trading with China by European countries.
<span>Dmitri Ivanovich Mendeleev</span>
He was a Russian chemist and inventor. He formulated the Periodic Law, created a farsighted version of the periodic table of elements,
and used it to correct the properties of some already discovered
elements and also to predict the properties of eight elements yet to be
discovered.