I'm taking a test and have to guess the right answer to the question after the article. Article: A king often felt unhappy and he asked a clever old man how he could be happy. "That's very easy," said the old man. "You just need to put on a happy man's shirt and you'll be happy." The king believed the old man and began to look for a happy man. He visited many countries and met kings, professors and others. But they all said they were not happy. One day he saw a poor farmer working in the field. The farmer was singing all the time and looked very happy. The king came up to him and asked, "Are you happy, my good man?" "Yes, quite happy," the farmer answered. "Can you sell me your shirt?" asked the king. "My shirt?" the farmer answered in surprise. "But I don't have a shirt. In fact, I never have one." ,. Question: The king thought the farmer was happy because the farmer _ . Options: A: worked very hard and looked tired B: was sleeping under a tree C: was singing all the time D: had a beautiful shirt
C