A robot is a machine that is able to perform a variety of tasks through the use of a computer. This computer is programmed to control movements of the robot's legs, arms, and other appendages by calculations of the various angles through which the robot's joints move. Robots are made ideal for assembly line factory work by these repetitive movements. Some robots are able to handle small parts that fit into small places. Other robots are able to operate tools such as paint sprayers.

Robots may even be developed with a sense of vision through the use of TV cameras as eyes. Scanning images and calculating sizes and positions of surroundings will help robots to perform many actions in the way that humans do. I want a robot to do my homework.

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

A) to tell a story about robots
B) to inform readers about robots
C) to entertain readers about robots
D) to persuade readers to buy robots