Answer: Prior to
Explanation: Picking "prior to" is basiclly saying do this and this BEFORE you leave the house. While as after is once you leave the house do all of thoes things which wouldn't make sense.
Aunt Edith gets upset after she offers Avery and Fern pie because Avery is being ungrateful and lets the frog he's holding hop around the kitchen, making her angry.
Your answer is: Avery is ungrateful
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