I am making a Google Form for evaluations. I will have a multiple choice question in there and the available options have to come from a list of items, say on a spreadsheet or a text document. I have figured out that I can create question using:

form.addMultipleChoiceItem()
.setTitle('Do you prefer cats or dogs?')
.setChoiceValues(['Cats','Dogs'])
.showOtherOption(true);

However, how do I make it so that the list of choices come from a spreadsheet?