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 truss is used to support the loading shown. Determine the required cross-sectional area of member BC if the allowable normal stress is sallow $\sigma $_allow= 24 ksi. <image 1>
A. 0.0556 in^2
B. 0.0252 in^2
C. 0.0356 in^2
D. 0.0451 in^2

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
C
The truss is used to support the loading shown. Determine the required cross-sectional area of member BC if the allowable normal stress is sallow $\sigma $_allow= 24 ksi. <image 1>
A. 0.0556 in^2
B. 0.0252 in^2
C. 0.0356 in^2
D. 0.0451 in^2

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