Who played the first April Fool's tricks?

Câu hỏi: Read the following passage and mark the letter A, B, C, D on your answer sheet to indicate the correct answer to each of the questions.
In 16th-century France, the start of the new year was observed on April 1st. It was celebrated much the same way it is today- with parties and dancing into the late hours of the night. Then in 1562, Pope Gregory introduced a new calendar to the Christian world, and the new year fell on January 18. Some people either didn't hear about the new calendar system or didn't believe the change had really been made. These people continued to celebrate New Year's Day on April 1st. They became the target of jokes. People played tricks on them and called them "April's fools." They sent them on a "fool's errand" or tried to make them believe that something false was true.
Today, some Americans continued the tradition by playing tricks on their friends on the first of April. One well-known trick or practical joke is to put salt in the sugar bowl. Something that college students do is to print false headlines in their college newspaper - such as "FREE BEER IN THE LIBRARY". Most April Fool's jokes are in good fun and not meant to harm anyone. The best April Fool's
joke is one where everyone laughs, especially the person the joke is played on.
Who played the first April Fool's tricks?
A. college students
B. Pope Gregory
C. non-Christians
D. 16th-century French people