
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
The expression $(7-\sqrt{z^2-49})^2$ simplifies to which of the following?
**A)** $z^2-14\sqrt{z^2-49}$  
**B)** $-z^2$  
**C)** $z^2$  
**D)** $(7-z)^2$  
**E)** $z^2-49$

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