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>Consider the following multifactor (APT) model of security returns for a particular stock.<image 1>  If T-bills currently offer a 6% yield, find the expected rate of return on this stock if the market views the stock as fairly priced.
A. 17.4%
B. 18.1%
C. 18.5%

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
Consider the following multifactor (APT) model of security returns for a particular stock.<image 1>  If T-bills currently offer a 6% yield, find the expected rate of return on this stock if the market views the stock as fairly priced.
A. 17.4%
B. 18.1%
C. 18.5%

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