For Which of the Following Situations Would a Within?subjects Design

Multiple Choice

For which of the following situations would a within?subjects design be the more appropriate design?

A) we want to know whether training rats to learn one maze will aid learning a second, different maze
B) we want to know whether rats prefer a solution sweetened with sugar more than a solution sweetened with saccharin
C) we want to know whether a particular brain lesion will affect a rat's preference for a sweet solution
D) we want to know whether ingesting alcohol will increase rats' preference for an alcoholic drink over a non-alcoholic drink