Given the question: Read the following article and select the best answer. Article: In ancient times, there was a painter. He was good at painting flowers and birds. But he never stopped practicing until he became very famous. An emperor of China also loved paintings,especially roosters . So he asked the famous painter to paint a rooster for him. He wanted the rooster to be the best among all his collections. The painter promised to do so. The emperor waited and waited for one year.,but he didn't get the picture. He couldn't waited to see the painter. He became angry and wanted to kill him. So the painter hurried into the palace with paper,paint and a brush. In five minutes, a perfect rooster was on the paper. After seeing this,the emperor became much angrier. "Since you can paint a rooster in five minutes, why did you keep me waiting for over a year?"he asked. "Your Majesty ,"said the artist. "I will let you know why.But you'll have to come with me. " he invited the emperor to his house. There, there were piles and piles of paper. On every piece of paper was a painting of a rooster. "Your Majesty ,"said the painter. "It took me more than one year to improve my painting skill in order to paint a perfect rooster for you. Question: In fact, during the whole year the painter _ - escaped from the emperor to live quietly - worked hard at practice drawing roosters - was invited to other places to draw roosters - drew piles and piles of paper to make a living
The answer is:
worked hard at practice drawing roosters