The code looks okay, I have some questions about splitting on “n”, but we can’t check that until there is something to split. It appears that
$choices = get_field('test2', 'option', false); is not getting anything, so you need start there.
Check that field name and that there is a value in it on the options page. Until you see the value that is in that field echoed by the following you can’t get any choices.
$choices = get_field('test2', 'option', false); // see what's in choices echo '<pre>',htmlentities($choices),'</pre>';
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