Sentence1: Alex suspected that his cat Tigger might have fleas. Sentence2: Tigger was constantly scratching himself day and night. Sentence3: Alex took Tigger to the veterinarian to be diagnosed. Sentence4: The veterinarian confirmed that Tigger did indeed have fleas. 
 (A) They gave him a flea medication and it cleared up. (B) Alex decided not to give the cat the medication prescribed.
B