Answer:
The answer is- The two teachers
Explanation:
The options are;
a. grades at the end of the semester
b. method of instruction (new versus old)
c. the two teachers
d. There is no extraneous variable in this study.
The answer is C- The two teachers
Extraneous variables are defined as variables that are not deliberately being studied in the experiment and the experimenter can not control. They give rise to a connection between two variables that are not casually related. Daniel's research involves two different methods (old and new) taught on two different days at two p.m