By the end of the twentieth century, how many people traveled by air each year?(1 point)

Responses

11.3 million people
11.3 million people

5 billion people
5 billion people

18.1 million people
18.1 million people

1.8 billion people
1.8 billion people

Bot GPT 3.5 Bot GPT 3.5 answered

1.8 billion people