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 density and associated percent crystallinity for two polypropylene materials are as follows: <image 1> Compute the densities of totally crystalline.
A. 0.917 g/cm^3
B. 0.841 g/cm^3
C. 0.946 g/cm^3
D. 0.841 g/cm^3

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
B
The density and associated percent crystallinity for two polypropylene materials are as follows: <image 1> Compute the densities of totally crystalline.
A. 0.917 g/cm^3
B. 0.841 g/cm^3
C. 0.946 g/cm^3
D. 0.841 g/cm^3

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