I need to know from the experienced webmasters out there the answer to this question (thanks):

For better organic ranking, what’s better for Google’s webbot (if someone searches for keyword/phrase "sporting equipment" for example):

a. Having keywords in the URL separated by an underscore, for example "sporting_equipment.html"
b. Having keywords in the URL run together; for example, "sportingequipment.html"
c. Having keywords in the URL naturally; for example, "sporting equipment.html"

I know that (besides the quality score, relevancy of landing page etc.), Google likes having the keywords the person searches for in the destination url as well.

Thanks very much for your thoughts/experience on which of the 3 is best.

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