Answers for "how to select only one option in radio button in html"

html radio only one checked

<!--Just manke both names equal -->
<input type="radio" name="options" id="1"/>
<input type="radio" name="options" id="2"/>

selecting only one radio button

<!-- Just give all the radio buttons the same name. 
Html will then allow you to select only one. -->

<input type="radio" name="radAnswer" />