【单选题】

Questions 11 to 13 are based on the following passage.At the end of the passage, you will be given 15 seconds to answer the questions.

Doctors evaluate the following about kidsEXCEPTA．how much TV they watch and what they see.
B．what video and computer games they play.
C．which websites they visit on the Interact.
D．how is their performance at school.