I don't know what you're talking about with "number C", but it sounds like a task in Minnie's Melodyland if I'm not mistaken.
Try viewing this wonderful thread that has all the tasks in MML,
The Dogfather's Minnie's Melodyland Task Guide.
Quote:
1. Dr. Fret - Dr. Fret's Dentistry on Alto Avenue
2. Task: Defeat 10 Number Crunchers (Minnie's Melodyland)
3. Return to Dr. Fret
4. Task: Defeat 20 Cashbots (Minnie's Melodyland)
5. Return to Dr. Fret
6. Task: Defeat A Cashbot Building (Anywhere)
7. Return to Dr. Fret
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Is that what you wanted?
If you're talking about where you can find Cashbots, Baritone Boulevard and Alto Avenue have the most Cashbots. (Mostly Baritone Boulevard, though.)