
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
Let $W$ be a 9-digit integer such as 135135135, where the first three digits are the same as the middle three and last three digits. Which of the following numbers must also be a factor of $W$?
A) 101  
B) 9901  
C) 10101  
D) 111  
E) 111111

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