Read the reading text and then choose the best answer :
In Viet Nam, there is great excitement built up well before Tet Nguyen Dan . First , every family organizes a trip to the cemetery to visit the graves of their ancestor . After that , to create an air of prosperity , wealth and fun for the first three days of the Lunar New Year , people are kept busy cooking traditional foods , buying gifts , and making other preparations . Certain items deemed to be bought or made are banh chung , dried watermelon seeds , tea , dried sausages , fruit ( fresh and candied ) , ornamental plants and flowers . Red and yellow flowers are ideal as they make the house more welcoming . On the New Year’s days , only good comments and wishes can be expressed . Children receive their li xi (or red envelopes with lucky money inside) People make a visit to family members , neighbors , and close friends . And people who live apart from their family try to get together on these days . Clearly enough , games and various forms of entertainment are staged and these often last a week . Varying traditional specialties including wrestling , buffalo fighting , dragon or unicorn dancing take place in different regions .
Trả lời câu hỏi dưới đây:
Why are red and yellow flowers popular in decorating the house at Tet ?