<ul style="list-style:none;">
  <li><label><input type="radio" id="delete_option0" name="delete_option" value="delete" />
  <?php _e('Delete all content.'); ?></label></li>
  <li><input type="radio" id="delete_option1" name="delete_option" value="reassign" />
  <?php echo '<label for="delete_option1">' . __( 'Attribute all content to:' ) . '</label> ';
  wp_dropdown_users( array(
    'name' => 'reassign_user',
    'exclude' => array_diff( $userids, array( $current_user->ID ) ),
    'show' => 'display_name_with_login',
    'role' => 'administrator',
  ) ); ?></li>
</ul>