Pat Has Developed a Test to Measure Aggression

Multiple Choice

Pat has developed a test to measure aggression.Pat gives the test to her developmental psychology class at the beginning of the term and again at the end of the term.Much to Pat's dismay, the results obtained at the end of the semester are completely different from those obtained at the start.What is a likely explanation for the difference in results?

A) The test does not have strong validity.
B) The test is not reliable.
C) The test is free from cohort effects.
D) The test is adequately standardized.