Read the passage. Circle A, B, C or D to answer each question.

Tay live mainly in the Northeastern part of Viet Nam. They live in large and crowded villages with hundreds of houses. They live in houses built on stilts. They are mainly farmers and they grow rice on terraced fields. They also raise cattles and poultry. Tay traditional dress is made from homegrown cotton. There is usually not much embroidery or other decorations. Women wear skirts or trousers, with short shirts inside and long one on the outside. They have many festivals and holidays in a year. The Lunar New Year and the mid-July festivals are the most lavishly organized. During festivals, people in many places play conthrowing, badminton, tug-of-war, dragon dancing, or chess. The Tay eat mainly sticky rice. On festival occasions, they make many kinds of cakes, such as banh chung(sticky rice square cakes), banh day(sticky rice round cakes) or banh khao(cakes made of whiterice flour). 

Which of the following best describes the main idea of passage?