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

My choice: Katrina used bleach.

Problem: Elena didn't have a headache after using the paint but Lindsey did because

My choice: Lindsey didn't use a face mask.

Problem: Matthew was an ace in the kitchen, but Ian was a novice, so the tasks typically fell on

My choice: Matthew .

Problem: Laura cleaned her tan asphalt shingles and Erin cleaned her black asphalt shingles.

My choice:
Erin had clean black shingles.