Read the passage: "In the past decade, paying by mobile phone has become common even in small towns. A vegetable seller can now accept money by showing a QR code. This has reduced the need to carry cash, but it has also exposed careless users to online fraud." The passage is mainly about:
Correct answer: A. the spread of mobile payments, with a benefit and a risk
Every sentence is about mobile payments: their spread, an example, one benefit and one risk. The other options are either too narrow or not stated.
medium