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><image 1>A light ray enters a block of plastic and travels along the path shown.By considering the behavior of the ray at point P, determine the speed of light in the plastic.(10^8m/s)
A. 0.44
B. 0.88
C. 1.13
D. 2.26

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
D
<image 1>A light ray enters a block of plastic and travels along the path shown.By considering the behavior of the ray at point P, determine the speed of light in the plastic.(10^8m/s)
A. 0.44
B. 0.88
C. 1.13
D. 2.26

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