
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
A triangular array of \( 3003 \) coins has \( 1 \) coin in the first row, \( 2 \) coins in the second row, \( 3 \) coins in the third row, and so on up to \( N \) coins in the \( N \)th row. What is the sum of the digits of \( N \)?
A) \( 11 \)  
B) \( 12 \)  
C) \( 13 \)  
D) \( 14 \)  
E) \( 15 \)

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