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 applying a unit ramp voltage source to a series RL circuit as shown in <image 1>. Compute the voltages $v_R (t)$ with zero initial condition for L = 0.1H;
A. t + (1 / 10) (e^{-20t} - 1) V
B. t + (1 / 20) (e^{-10t} - 1) V
C. t + (1 / 10) (e^{-10t} - 1) V
D. t - (1 / 10) (e^{-10t} - 1) V

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
Consider applying a unit ramp voltage source to a series RL circuit as shown in <image 1>. Compute the voltages $v_R (t)$ with zero initial condition for L = 0.1H;
A. t + (1 / 10) (e^{-20t} - 1) V
B. t + (1 / 20) (e^{-10t} - 1) V
C. t + (1 / 10) (e^{-10t} - 1) V
D. t - (1 / 10) (e^{-10t} - 1) V

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