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 a consumption function, what happens to the consumption-line C in graph 1 if (1) a rises; (2) b rises? <image 1>
A. C shifts upwards. 
B. (1)C shifts downwards. (2) C gets gentler.
C. (1)C gets steeper. (2) C gets gentler.
D. (1)C shifts downwards. (2) )C gets steeper.

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
A
Consider a consumption function, what happens to the consumption-line C in graph 1 if (1) a rises; (2) b rises? <image 1>
A. C shifts upwards. 
B. (1)C shifts downwards. (2) C gets gentler.
C. (1)C gets steeper. (2) C gets gentler.
D. (1)C shifts downwards. (2) )C gets steeper.

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