Long ago, two flowers, rose and lily lived together in a garden. The rose flower was more beautiful than the lily flower. The lily said to the rose, "You are so beautiful. You have a very lovely smell. I wish I was like you." The lily flower started crying.The rose flower replied, "I am beautiful but I live for a very short period of time. But I am not crying. You are very lucky that you have a long life. You should never cry and always be happy."The lily flower smiled and became very happy.The rose flower advised the lily flower to be always ______.

• A. bad
• B. sad
• C. helpful   
• D. happy
• E. None of these