Problem: Katrina was able to remove the mildew from the tub but not Christine because

My choice: Christine used hand soap.

Problem: Dennis answered every question correctly on the test Brett gave them, so

My choice: Brett was impressed.

Problem: Austen and Sara were tired of clothes cluttering their home but kept the gifts because the

My choice: gifts were sparse.

Problem: In the crime scene Megan had to take the measurement of Monica's blood loss since

My choice:
Megan was the investigator.