I found the answer.
Multiwidget is a nice new feature within wordpress’ new widget API. Yet there is sparse documentation on how to use it.
$options = get_option( 'your_option_id' );
if( isset($options) && isset($options[$this->number])) {
//$this->number returns the unique widget id that corresponds to the database index
$instance_options = $options[$this->number];
}
//now use $instance_options['setting']
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