Which One of the Following Statements Reflects a Concern About

Multiple Choice

Which one of the following statements reflects a concern about the separation and control of variables?

A) "How do you think I should make amends with Martha? If I tell her I'm sorry,she might think I'm lying."
B) "I'm catching more tadpoles today,but I don't know if it's because I'm using a larger container to catch them or because I'm scooping from a different part of the pond."
C) "I have two tests to study for tonight-science and Spanish. I'll study one subject before dinner and the other one after dinner so I don't get them confused."
D) "I'm trying to learn how to do a lay-up shot in basketball. Can you show me all the things I should do,going one step at a time?"