How are entries ordered in a reference list

Answer me pls is an algorithm that has been coded into something that can be run by a machine.

Before you record your own voice, you should a. record other people's voices b. warm up and practice difficult names c. listen to your favorite songs d. read a transcript of a good radio news segment

The song about casey jones a railroad engineer who gives his life on the job would most likely gall under the folk song category of? a-work song b-nonsense song c-religious song d-ballad