
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 sign pyramid with five levels. A cell at any level receives a "+" if the two cells directly below it have the same sign, and it receives a "-" if they have different signs. Determine how many ways there are to fill the five cells in the bottom row so that the top of the pyramid has a "+" sign.
A) 8 
B) 10 
C) 15 
D) 17 
E) 20

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