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>A vertical force of P=1500 N is applied to the bell crank. Determine the average shear stress developed in the the 6-mm diameter pin B that is subjected to double shear. <image 1>
A. 60.5 MPa
B. 62.2 MPa
C. 40.5 MPa
D. 40.2 MPa

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
A vertical force of P=1500 N is applied to the bell crank. Determine the average shear stress developed in the the 6-mm diameter pin B that is subjected to double shear. <image 1>
A. 60.5 MPa
B. 62.2 MPa
C. 40.5 MPa
D. 40.2 MPa

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