单项选择题

I’m a reporter of a TV station. I go to No. 1 Middle School this Friday afternoon. I want to know how often they take exercise. How do they like their school How do they study for exams What do they usually do at home
There are 56 students in Class Three, Grade Nine. Thirty of them are boys. The others are girls. Most of the boys like playing basketball, tootba11 and table tennis. Some girls like volleyball and tennis.
It’s interesting that some students are good at their subjects but they don’t like sports, and some students like sports but they don’t like studying. Taller boys study worse than shorts ones. The shorter boys don’t like taking exercise. Less exercise makes them grow slowly. All the students love their school.
Most students do their homework first at home. After that they watch TV. About half of them can’t clean the rooms or wash clothes. They don’t help their parents do housework. They can’t look after themselves well at home.
The results of the survey make me unhappy. Most parents spoil their kids. I think kids should do some housework at home. It can help kids to grow up in health and ideas.
About ______ of the students don’t do any housework at home.

A. 20%
B. 30%
C. 50%