Single choice and multiple choice questions helper sentences

I am trying to find the more appropriate helper sentences, e.g. for a single choice question:

“check” only one of the options
OR “check” only one of the answers

Is there a better way to say this!?

Also, for multiple-choice questions:

You can “check” more than one option OR You can “check” more than one answer

Can I replace the word “check” with something better?
is it ok if I say “Select” instead! I’m open to your suggestions

P.S. this is in a questionnaire context, in a mobile app