Carla wants to know how many students in her school enjoy watching reality tv shows. she asks all 22 students in her science class and finds that 40% of her classmates enjoy watching reality tv shows. she claims that 40% of the school's student population would be expected to enjoy watching reality tv shows. is carla making a valid inference about her population?

a. no, it is not a valid inference because she asked all 22 students in her science class instead of taking a sample from her music class
b. no, it is not a valid inference because she asked all 22 students in her science class instead of taking a sample of the students in her school
c. yes, it is a valid inference because she asked all 22 students in her science class
d. yes, it is a valid inference because her classmates make up a random sample of the students in the school