Answer: Considering the sentences provided, Susan supports opinion with facts.
Explanation: The sentences provided indicate that Susan supports her opinion that the party should be held on Saturday by making reference to the results of a survey and to the availability of the band. In this case, both the results of the survey and the availability of the band can be taken as facts. In that way, Susan does not resort to the manipulation of people's emotions nor to the use of words with a extreme connotation to support her idea: she only supports her opinion based on facts.