What is the most important step in prioritizing goals?
a.
determining categories for various goals
b.
deciding what is most important
c.
writing a list of goals
d.
having multiple tasks lined up for each goal

The most important step in prioritizing goals is B. deciding what is most important. If you know what is most important to you, you will prioritize that option, and focus on that first, and then deal with whatever else is left, because those other things are not as important as the first thing on your list. Other options are also important, but deciding for yourself what you think is the most relevant thing for you is the first thing you should do.