We did a survey about protecting the environment and saving resources (资源). Look at the form. Class 1 and Class 2 have the same number of the students. Then students in Class 2 ride or walk to school.

	Recycling things	Reusing things	Riding or walking to school	saving electricity
Class 1	10%	40%	12	20%
Class 2	25%	30%	？	10%

A、35

B、25

C、14