Researchers Were Interested in Whether Attitude Similarity Between Partners in a Dyad

Researchers were interested in whether attitude similarity between partners in a dyad influenced the creativity of the outcome product they produced. To do so, researchers measured partner A's attitudes and partner B's attitudes toward hierarchy, and then computed a difference score to reflect an overall measure of (dis) similarity. In other words, the variable of interest is the extent to which partners A and B differ on the same attitudinal items. In this example, attitudes toward hierarchy is a _____(a) _____ variable, and similarity is a _____(b) _____ variable.

A) within-dyad variable; between-dyad variable
B) mixed variable; within-dyad variable
C) monadic variable; between-dyad variable
D) between-dyad variable; mixed variable