
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
Find the sum $2i + 3i^2 + 4i^3 + ... + 2003i^{2003}.$
A) $-1000 + 999i$
B) $-999 + 997i$
C) $-1001 + 997i$
D) $-1000 + 997i$
E) $997i$

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