Given the question: Read the following article and select the best answer. Article: There are many TV programs about Chinese dishes, but few are Like A Bite Of China . The seven-part documentary tell us food in different places in China. The different kinds of food on TV are from 60 places. You can see many kinds of food and they can _ your eyes and stomach. And you also learn how to make the food . That's why the program becomes so popular. However, the program is not only about food. There are many different stories between food and people. To know good stories, workers of the film spent three months doing the research and nine months filming. Liu Wen, one of the workers, says the story also shows the social transportations . "The program is like a window, it makes the world know more about China. And it helps people around the world not only enjoy Chinese dishes, but also learn Chinese culture." Question: How long did the workers spend finishing the whole program? - three months - nine months - six months - a year
The answer is:
a year