The correct answer is B: by. When referring to means of transport, the preposition 'by' is used: 'by bus', 'by car', 'by train', etc. Hence the correct preposition is 'by'.
A.on
B.by✓ Correct
C.at
D.with
Explanation
When referring to means of transport, the preposition 'by' is used: 'by bus', 'by car', 'by train', etc. Hence the correct preposition is 'by'.
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