Question:What is used to decorate a house?

Choose the letter A, B, C or D to answer these following questions
Vietnamese has a lot of traditions at Tet. They believe that the first-footer of a family determines their luck for the next year. Usually, people will invite a good-tempered, moral and successful person to visit their houses. During Tet, people visit relatives and friends to exchange best wishes. Children will dress in new clothes. They will receive lucky money for good blessings. Family gathering is really important because it’s time family members get together after a long year. At Tet every house is usually decorated by flowers and colored lights.