Answer: Misinformation effect
Explanation: Misinformation effect is a phenomenon where a person's memory is interfered with due to a post event information given. When an individual gives an erroneously or less accurate narration of an even that unfolded before him or her, that is called misinformation effect. Yancy's memory couldn't recall whether the robber was an adult or a teenager, Yancy's erroneous post event information narration best illustrates misinformation effect.