Choose the best answer A, B, C or D to compete the following passage.
Lunar New Year, or Tet, is Vietnam’s main (21)______ It is the grandest and most (22)______ occasion in the year which falls sometime between 19th January and 20th February on the Western calendar.
On the days of Tet, everyone tries to be nice and (23)______ to each other. People believe that what they do (24)______ the first day of the year will influence their luck during the whole year. Thus, only positive comments should be (25)______.
(23)______
A.impolite
B.rude
C.polite
D.please