
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
Consider a $4\times4$ grid where each row and each column contains each of the numbers $1, 2, 3, 4$ exactly once. The initial setup of the grid is given as:
\[\begin{tabular}{|c|c|c|c|}\hline 
1 & & & 4 \\ \hline 
& 2 & & \\ \hline 
& &  & 3\\ \hline
& & D & \\ \hline
\end{tabular}\]
Suppose $C$ and $D$ are two numbers in the grid. Determine $C+D$.
A) 3
B) 4
C) 5
D) 6

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