Final answer:
In general, presenting fixed choice answers in vertical form is better due to space efficiency, clarity, and lack of bias for multiple choices.
Step-by-step explanation:
In general, it is better to present fixed choice answers in vertical rather than horizontal form for several reasons. Firstly, vertical format takes up less space on the page, allowing for a more compact and concise layout. Secondly, it makes the layout of the questionnaire more clear and unambiguous, as respondents can easily see and select their choices in a vertical list. Lastly, this format does not necessarily encourage respondents to choose more than one answer; that would depend on the design of the questionnaire itself.