
Passage: A tour group went to the Mulan paddock for a trip. The group members rode horses, shot arrows, ate barbecued meat, and finally went to the store to buy souvenirs. Known: (1) Someone bought a Mongolian knife. (2) Someone did not buy a Mongolian knife. (3) Both Mr. Zhang and Ms. Wang from the group bought Mongolian knives.
Question: If only one of the three sentences above is true, which of the followings must be true?
A. A.Neither Mr. Zhang nor Ms. Wang bought Mongolian knives.
B. B.Mr. Zhang bought a Mongolian knife, but Ms. Wang did not buy a Mongolian knife.
C. C.Mr. Li of the tour group bought a Mongolian knife.
D. D.Both Mr. Zhang and Ms. Wang bought Mongolian knives.
Answer: