
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
In a racing track consisting of two concentric circles, the width of the track is given as 15 feet. If the radius of the inner circle is twice that of an unknown radius $r$, determine the difference in the circumferences of the two circles.
A) $15\pi$ feet
B) $20\pi$ feet
C) $30\pi$ feet
D) $40\pi$ feet

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