bicentennial : 200 ::
  1. vicennial : 25
  2. sesquicentennial : 150
  3. quinquennial : 50
  4. perennial : 1
Explanation
Answer: Choice (B) is correct. Bicentennial means occurring every 200 years. Vicennial means occurring every 20 years, so choice (A) is incorrect. Quinquennial refers to something that occurs every 5 years, and perennial refers to something that is continuous, or all the time. Sesquicentennial refers to something that occurs every 150 years, so choice (B) is correct.

This is a bit of an odd analogy, we know, but we wanted to include it to get you thinking about word roots.
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