
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
In the following incorrect addition, determine what is the smallest digit that can be changed to correct the addition:
$\begin{tabular}{rr}
&\ \texttt{7 5 3}\\
&\texttt{6 8 4}\\
&+\texttt{9 2 1}\\
\hline
&\texttt{2 5 5 8}
\end{tabular}$
A) 5
B) 6
C) 7
D) 8

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