An Experimenter Tests the Reading Skills of Some 10-Year-Old Children

Multiple Choice

An experimenter tests the reading skills of some 10-year-old children, puts them on a low-fat diet for 6 months, retests their reading skills, and finds that most show a significant improvement in their reading. The experimenter concludes that a low-fat diet improves intellectual development. One major defect in this study is the lack of any

A) dependent variables.
B) demand characteristics.
C) control group.
D) independent variables.