题目内容：
根据以下材料，回答题Have you ever been asked by your Chinese friends,“What is your zodiac sign?”If you say“I'm a Pig, ”they immediately know you are either 24,36,48 or 60 years old.Asking a zodiac sign is a polite way of ask-ing your age. By showing your zodiac sign, you are also being evaluated. Maybe you don't believe in the Chi-nese zodiac. However, as a quarter of the world population is influenced byit, you'd be wise to do something about that.
The zodiac signs is a 12-year cycle marked with animals, starting with a Rat and ending with a Pig. For example, if you were born in 2000, you are a Dragon. If you were born in 2001, you are a Snake. If you were born in 2002, you are a Horse.
Over thousands of years, the zodiac sign has affected the Chinese's major decisions,some of which are quite amazing. In romantic relations, a Pig girl is believed to be in a perfect romance with Tigers, Goats and Rabbits, while Snakes are supposed to be their natural enemies. Some Chinese parents also try to avoid hav-ing babies with certain zodiac signs. That's why January 2015, the last month for the Year of the Horse saw a common choice of cesarean section (剖宫产) ahead of the expected date of childbirth. It's not because they like Horse so much, but because babies born next month are Goats, which are a zodiacsign not favored by Chinese parents. A Tiger is another undesirable zodiac sign, due to its aggressiveness. Many Chinese regions saw a sharp decline of birthrate during those years.
The belief and tradition of the zodiac sign have been existing over thousands of years and the trend of us-ing it in making major decisions has gone upwards for the past few decades. As China plays such an impor-tant role in the global economy and politics, Chinese culture and traditions have been influencing more peo-ple around the world.
( ) What does the author mainly talk about in Paragraph One? A．A polite way of asking ages.
B．A brief introduction of zodiac signs.
C．The influence of China in the world.
D．The belief of foreigners.
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