Petra read these lines in a robotics magazine.

robots are the world's greatest invention! robots can make life easier for humans. they go places people do not want to; for example, some robots explore inside volcanoes or gas tanks. the word robot comes from the czech word robota, which means "forced labor." robots are great because they can do our work and never get tired or bored.

what is the author's opinion, and what evidence is used to support it?

the author's opinion is that robots explore volcanoes. this opinion is supported by a definition of the word robot.

the author's opinion is that robots make life easier for humans. this opinion is supported by the statement that robots are the world's greatest invention.

the author's opinion is that robots are the world's greatest invention. this opinion is supported by real-life examples of robots at work.

the author's opinion is that the word robot comes from a czech word. this opinion is supported by the definition of "forced labor."