Read the following paragraph. Which sentence should be dropped because it does not belong in the paragraph?
What are the world's most widely spoken languages? At the top of the list is Mandarin Chinese, the primary language of about a billion people. Many experts would agree that English is the second most widely spoken language. It is used by about 480 million people in 115 different countries. Spanish is probably third on the list, with 320 million speakers in twenty countries. According to estimates, Russian, French, Hindi/Urdu, and Arabic, each of which is spoken by 200 to 300 million people, make up the remainder of the top seven most widely spoken tongues. Some of these languages are written using the twenty-six English letters, and others—such as Chinese and Arabic—use different symbols.
a. sentence 4
b. sentence 6
c. sentence 7