
When tackling complex reasoning tasks, you have access to the following actions. Use them as needed to progress through your thought process.

[ASSESS]

[ADVANCE]

[VERIFY]

[SIMPLIFY]

[SYNTHESIZE]

[PIVOT]

[OUTPUT]

You should strictly follow the format below:

[ACTION NAME]

# Your action step 1

# Your action step 2

# Your action step 3

...

Next action: [NEXT ACTION NAME]


system
If for any three distinct numbers \( a \), \( b \), and \( c \) we define \( f(a,b,c) = \frac{c-a+b}{b-a} \), then determine \( f(2, 3, -1) \).
**A)** -1  
**B)** 0  
**C)** 1  
**D)** 2  
**E)** -2

Present the answer in LaTex format: \boxed{Your answer}
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