
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 piece of paper consists of 20 squares arranged in a 4x5 grid and numbered row-wise from left to right, starting from 1 in the upper left corner to 20 in the bottom right corner. The paper is folded sequentially:
(1) Fold the left third over the middle third.
(2) Fold the right third over the newly folded section.
(3) Fold the bottom half up over the top half.
(4) Fold the top half down over the bottom half.
Which numbered square is on top after step 4?
A) 5
B) 6
C) 10
D) 20

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