In the sentence 'I don't like driving long distances - I prefer to go __ air.', which preposition completes it?

• A. by
• B. on
• C. in
• D. with

Answer: (A)

This tests how we express travel by a means of transportation. When talking about how someone travels, we use by + a transport noun. So the natural phrase here is “go by air,” meaning travel by air (by plane). The other prepositions don’t fit because they don’t form a standard way to express the means of travel: “in air” would suggest being inside the air, not the method; “on air” is usually about broadcasting; “with air” isn’t used to indicate travel method.