2015年1月，市教育局在全市中小学中选取了63所学校从学生的思想品德、学业水平、学业负担、身心发展和兴趣特长五个维度进行了综合评价．评价小组在选取的某中学七年级全体学生中随机抽取了若干名学生进行问卷调查，了解他们每天在课外用于学习的时间，并绘制成如下不完整的统计图．

根据上述信息，解答下列问题：

D

    Do you have a lucky number? What is it? Many people have a special number. They hope it will bring them good luck.

    In Chinese culture, people believe some numbers are lucky or unlucky. This is based on the Chinese word that the number sounds similar to. 

    For example, the Chinese word for the number 8 sounds like the word for "making a fortune". So, people consider it a very lucky number. Some people spend a lot of money to have 8s in their phone numbers or vehicle license plate (车牌照) numbers. The opening ceremony of the Beijing Olympics began at 8:08 pm on August 8, 2008.

    The number 9 is also a lucky number because of its connection to the emperors (皇帝) of China. There were nine dragons on emperors' robes (龙袍). Today, 9 often stands for "long lasting". That's why a man always proposes to (向…求婚) a woman with 99 or 999 roses.

    So what's a "bad luck" number in China? It might be 4. Many Chinese people see 4 as a "bad luck" number because it sounds similar to the character for "death".

    Because of this, many buildings skip the fourth floor, and simply call it the fifth floor. In Hong Kong, some buildings even skip all floors numbered with 4, such as, 4, 14, 24, 34 all 40-49 floors. Some buildings also skip the 13th floor, as 13 is an unlucky number in the West. As a result, a building whose highest floor is 50 may actually have only 35 floors.