[021] Students in Athletic Clubs
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(A) Students in athletic clubs practice very hard in order to win as many events as possible on the field day.
(B) Students in athletic clubs practice very hard in order to win as many events as possible on the field days.
(C) Students in athletic clubs practice very hard in order to win as many events as possible on their field day.
(D) Students in athletic clubs practice very hard in order to win as many events as possible on their field days.
(E) Students in athletic clubs practice very hard in order to win as many events as possible on field days.
Which do you think is/are correct?
I'd appreciate your opinions!
(B) Students in athletic clubs practice very hard in order to win as many events as possible on the field days.
(C) Students in athletic clubs practice very hard in order to win as many events as possible on their field day.
(D) Students in athletic clubs practice very hard in order to win as many events as possible on their field days.
(E) Students in athletic clubs practice very hard in order to win as many events as possible on field days.
Which do you think is/are correct?
I'd appreciate your opinions!

(A) and (C) are unacceptable.
(D) is okay, and (B) is odd but acceptable.