
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
The letters $A$, $B$, $C$, and $D$ represent digits in the following arithmetic operations:
$$\begin{tabular}{ccc}
 &1&A&B\\ 
+&C&A&A\\ 
\hline 
 &D&A&B\end{tabular}$$
and
$$\begin{tabular}{ccc}
  &1&A&B\\ 
-&C&A&A\\ 
\hline 
  &1&A&0\end{tabular}$$
What digit does $D$ represent?
- **A)** 1
- **B)** 2
- **C)** 3
- **D)** 4
- **E)** 5

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