What is the difference between a radio button and Dropdown List?
Think about a multiple choice quiz—you'd give your students Radio Buttons so they could choose one answer for each question and see each choice the entire time. A Dropdown List field can be used to create a list of items that you want a user to choose from—for example, selecting a day of the week.
Should radio buttons be in a list?
If you want to use horizontal lists, make sure that there is plenty of space between each entry. It's often better to use checkbox lists or radio button lists, rather than dropdowns, because all of the options are visible to the user. When there are many options, though, this can become unwieldy.