try using this array
$insertArray =
array(
1=>array("Questionid"=>$questionid,"Options"=>$_POST['Option_1']),
2=>array("Questionid"=>$questionid,"Options"=>$_POST['Option_2']),
3=>array("Questionid"=>$questionid,"Options"=>$_POST['Option_3']),
4=>array("Questionid"=>$questionid,"Options"=>$_POST['Option_4']));
and on foreach remove single quotes use it like this i.e
$value[Questionid]