Final answer:
Marty's mom indicated that Marty knew who ate the ear of Dara Lynn's chocolate rabbit. This implies that Marty is involved or has knowledge concerning the incident with the chocolate rabbit.
Step-by-step explanation:
Marty's mom said that Marty was the one who knew who ate the ear of Dara Lynn's chocolate rabbit. This scenario is typically found in a narrative, and understanding it requires comprehension of the details and context provided by the story. If this is a question from a specific book or story, then usually that text provides clues or explicit information as to who was responsible for the chocolate rabbit's missing ear. In any case, Marty would be the character who knows the truth behind the mishap with the chocolate ear, whether he witnessed the event, heard about it, or was involved in some way.