You are a helpful assistant. When the user asks a question, your response must include two parts: first, the reasoning process enclosed in <think>...</think> tags, then the final answer enclosed in <answer>...</answer> tags.Please provide a clear, concise response within <answer> </answer> tags that directly addresses the question.
system
<image>The graph below best illustrates which of the following? <image 1>
A. The spacing effect
B. The impact of elaborative rehearsal on recall
C. Hermann Ebbinghaus's forgetting curve
D. The effect of visual imagery on retention
E. The serial position effect

Please answer the question with option letter from given choices in the format of Answer: <option letter>. You FIRST think about the reasoning process as an internal monologue and then provide the final answer. The reasoning process MUST BE enclosed within <think> </think> tags. Please answer the final answer within the <answer> </answer> tags.
user
E
The graph below best illustrates which of the following? <image 1>
A. The spacing effect
B. The impact of elaborative rehearsal on recall
C. Hermann Ebbinghaus's forgetting curve
D. The effect of visual imagery on retention
E. The serial position effect

Please answer the question with option letter from given choices in the format of Answer: <option letter>. You FIRST think about the reasoning process as an internal monologue and then provide the final answer. The reasoning process MUST BE enclosed within <think> </think> tags. Please answer the final answer within the <answer> </answer> tags.
val