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> The structural formula of the glycinium cation is shown above. Arrows indicate the $pK_a$ values for the labile protons in the molecule. Which of the following is true about the geometry of the glycinium cation?
A. The leftmost C atom and all the atoms directly bonded to it lie in the same plane. 
B. Both C atoms and both O atoms lie in the same plane. 
C. The N-C-C bond angle is 180°.
D. The geometry around the N atom is planar.

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
<image 1> The structural formula of the glycinium cation is shown above. Arrows indicate the $pK_a$ values for the labile protons in the molecule. Which of the following is true about the geometry of the glycinium cation?
A. The leftmost C atom and all the atoms directly bonded to it lie in the same plane. 
B. Both C atoms and both O atoms lie in the same plane. 
C. The N-C-C bond angle is 180°.
D. The geometry around the N atom is planar.

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