Which of the following did garrett morgan invent?
a.) the telephone
b.) the traffic light
c.) the automobile
d.) the airplane

Option (B)

Explanation:

Garrett Morgan was an African-American inventor who made many new inventions, one of which is the traffic light that is commonly used in today's world. He was also a businessman and a good political leader.

He noticed that all the vehicles, including the cycles, pedestrians had to use to the same road, as a result of which numerous accidents have taken place. So, in order to control and reduce the number of accidents he came up with this idea of the traffic light, which was successful in controlling the number of road accidents. This is how the traffic light system was invented.

Thus, the correct answer is option (B).