
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
Before Bob started a four-hour drive, his car's odometer reading was 12321, a palindrome. At his destination, the odometer reading was another palindrome. If Bob never exceeded the speed limit of 85 miles per hour, which of the following was his greatest possible average speed?
A) 72.5 miles per hour
B) 75 miles per hour
C) 77.5 miles per hour
D) 80 miles per hour

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