
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
Evaluate 
\[\frac{1}{t_1} + \frac{1}{t_2} + \frac{1}{t_3} + ... + \frac{1}{t_{2003}}\]
where \( t_n = \frac{n(n+1)}{2} \) is the $n$th triangular number.
A) $\frac{2005}{1002}$  
B) $\frac{4006}{2003}$  
C) $\frac{2003}{1001}$  
D) $\frac{2003}{1002}$  
E) 2

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