
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 $5 \times 5$ calendar block with consecutive dates starting from 1 to 25. First, the order of the numbers in the first and the third rows are reversed. Then, the sums of the numbers on each of the diagonals (main diagonal: top left to bottom right, secondary diagonal: top right to bottom left) are calculated. Find the positive difference between these two diagonal sums.
- **A)** 6
- **B)** 8
- **C)** 9
- **D)** 10
- **E)** 12

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