Answer:
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Typically the contact details for the firm would be at the bottom of the flyer.
This is to allow room for the main event itself to be advertised in top and central area of the flyer real-estate.
The answer to this should be B. Worm. A pinion is a the smallest gear out of the listed ones above. spur would be next then wheel and the biggest if them all would be the spur. I'm not completely sure if my answer is 100% correct, but I feel confident enough about it. Hope this helps. :)