Read the text. Circle the correct option (a-d).

20th-century inventions

The most important modern invention has to be the mobile phone. It was only invented in the 1970s, but look at it now! Everyone has a phone. Originally, of course, phones were large and were only used to make phone calls. Now those phones are in museums! Modern mobile phones are mini-computers - you can do so much with them. You can buy very expensive phones, but you can also buy cheap models. That's why, in my view, it's the best 20th-century invention.


What is the purposes of the text?

a. to advertise mobile phones

b. to invite people to a museum exhibition

c. to give an opinion about an invention

d. to advise people to avoid cheap phones