The entry for option in the element-role mapping has a dead link for "list of options".
The ARIA in HTML spec links to https://html.spec.whatwg.org/multipage/input.html#attr-input-list. From my reading this means that <option> has a role of option if and only if it is a <datalist><option>.
Is it correct for <select><option> or <select><optgroup><option> not to have a role of option? As one data point Chrome and Firefox both expose <select size=2><option> as having role=option