Student or Learner
Which of the following is/are of interest to you?
Business / Finance
Kids & Education
Electronics / Computers
Is 'are' correctly used? I think 'is' is the correct word.
It depends whether you expect one answer or more than one. It becomes clear in these utterances.
If you had to choose one category, which of the following is ...
If you could choose several categories, which of the following are ...
It depends if you are expected to choose one category or several.
I can select one or more of what is offered.