Choosing A Tenant

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I advertised my unit on craigslist. In one day I got 3 perspective tenants who filled out applications and made out checks for the screening. Out of the three one looked really good on paper and I really liked her (a single girl the first one to apply). The next day a couple who both looked really good on paper, have individually and combined higher income than the single girl and whom I liked applied. My conundrum is, do I have to submit all the applications to the screening company or just the two that I like? Also if both the single girl and the couple pass the screenings how do I choose and what do I tell the other applicants?