
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 the digit $9$ is placed after a two-digit number whose tens' digit is $t$, and units' digit is $u$, the new number becomes:
**A)** $10t + u + 9$\
**B)** $101t + 9u$\
**C)** $100t + 10u + 9$\
**D)** $t + u + 9$\
**E)** None of these answers

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