Final answer:
C. Two or three people on a bike is a common occurrence. The best way to improve the plodding passive voice in the sentence 'It is a common occurrence to see two or three people on one bike' to a more interesting and easier to read active voice is option C. The revised sentence would be 'Two or three people on a bike is a common occurrence.'
Step-by-step explanation:
The best way to improve the plodding passive voice in the sentence 'It is a common occurrence to see two or three people on one bike' to a more interesting and easier to read active voice is option C. The revised sentence would be 'Two or three people on a bike is a common occurrence.' This active voice sentence is clearer and more succinct, making it more engaging to the reader.