In Dr. Segal's study of the effects of television watching on the language development of children under the age of 2, which of the following would you recommend to operationalize the dependent variable?
A) The cumulative amount of time spent watching television during the study
B) A count of the number of words each child knows at the end of the study
C) The amount of time per session spent watching television
D) A count of the number of words each child knows at the beginning and end of the study
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