The finishing position of each runner are:
Sunny came 1st, and wore No 2, with color Red
Kristy came 2nd and wore No 3, with color Yellow
Edna came 3rd and wore No 1, with color Green
Jennifer came 4th and wore No 4, with color Blue
Given that the question revealed that Sunny came first, that is settled; then the runner wearing number 2 wore red,
Also Kirsty beat Edna, and the person who came second wore number 3, however, Jennifer didn't wear yellow which makes Kristy to be the person.
The runner in yellow beat the runner in green, and since Jennifer is not the one in yellow, then that means it is Edna, and it is revealed that Edna wore number 1.
Hence, since only one of the runners wore the same number as their final position, which Blue, then the person available is Jennifer.
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