making check boxes clickable once in javascript?

Sorry but im an absolute noob with javascript. Ive made a form for a simple quiz but cant figure out how to make radio's only click once. I can select two or three buttons as my answer. i want to change this.

Film speed refers to:

How long it takes to develop film.

How fast film moves through film-transport system.

How sensitive the film is to light.

None of these makes sense.
ive been rooting around w3shcools tutorials to no avail. can someone shed some light?

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