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Read the following passages and select correct options to answer the questions that follow.

Television - history and development

Televisions show pictures with sounds. They get data from cables, discs, or over-the-air signals. They turn this data into sounds and images. People watch news and shows on them. You probably call them TVs for short. John Baird made the first TV in 1925. It had one color. It could only show 30 lines. This was just enough room for a face. It didn't work well, but it was a start. The first TV station was set up in 1928. It was in New York. Few people had TVs. The broadcasts were not meant to be watched. They showed a Felix the Cat doll' for two hours a day. The doll spun around on a record player. They were experimenting. It took many years to get it right. By the end of the 1930s, TVs were working well. America got its first taste at the 1939 World's Fair. This was one of the biggest events ever. There were 200 small, black and white TVs set up around the fair. The U.S. President gave a speech over the TVs. The TVs were only five inches big but the people loved it. They wanted TVs. But World War II was going on during this time. Factories were busy making guns and bombs. When the war was over, TV spread across the country. By 1948 there were 4 big TV networks in America. They aired their shows from 8 to 11 each night. Local shows were aired at other times. Most of the time, nothing was shown at all. TV was not 'always on7 like it is now. Colour TVs came out in 1953. They cost too much money for most. Also, shows were aired in black and white. By 1965, colour TVs were cheaper. TV stations started airing shows in colour. People had to switch if they wanted to see the shows. Now most TVs are high-def. This means that they have many lines on them. This makes the image clear. TVs have come a long way since Baird's 30-line set. High - def TVs have 1080 lines. There are state-of-the-art sets called 4K TVs. These TVs have 3,840 lines. Some people watch TV in 3D. I wonder what they will come up with next. Smell-o-vision anyone?

What is the author's main purpose in writing this?

A)  He is trying to explain how a TV works.

B)  He is telling readers how TVs became popular.

C)  He is describing the history and development of TV.  

D)  He is trying to get people watch TV.