
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
A \(5 \times 5\) grid of squares on a piece of paper are numbered from 1 to 25 in a row-major order. The paper undergoes the following sequence of folds while lying flat on a table:
(1) Fold along the diagonal from the bottom left to top right, bringing the bottom left up to meet the top right.
(2) Fold the left half over the right half.
(3) Fold the top half over the bottom half.
(4) Fold the bottom half over the top half.
What numbered square is on top after step \(4\)?
A) 13  
B) 17  
C) 21  
D) 25

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