How to populate a dropdown from result_array

I have form that needs data from the database. The form is for adding an office. An office belongs to a department, so when a new office is added it should be added to the right department. What I want to do is when I call the add_form view the dropdown in this view should be populated by data which is obtained from the database. Here is my code:
Here is the code that searches through the departments table and retrieve all the departments from the contacts_model

Code:

public function get_departments() {
       //query
       $query = $this->db->get('departments');
       //return the result
       return $query->result_array();
   }

Here is the code that loads the add form view in the phones model

Code:

 //if the passed value is one show the add department view
       if($param == 2){
            $data['title'] = 'Add College Office';
            $departments['departs'] = $this->contacts_model->get_departments();
           
            $this->load->view('templates/header', $data);
            $this->load->view('addoffice.php', $departments);
            $this->load->view('templates/footer');
       }

Here is the code to display my view

Code:

<h1 align="center">ADD COLLEGE OFFICE</h1>
       <div align="center">
 <p><?php echo validation_errors(); ?></p>
 <p><?php echo form_open('phones/addOffice') ?></p>
 <table width="303" border="1">
   <tr>
     <th width="119" scope="row"><?php echo form_label('Office', 'office'); ?></th>
     <td width="168">  
      <?php
       $data = array(
                 'name'        => 'office',
             'id'          => '',
             'value'       => '',
             'maxlength'   => '150',
             'size'        => '100',
             'style'       => 'width:50%');
              echo form_input($data); ?>
             </td>
   </tr>
   
     <tr>
       <th scope="row"><?php echo form_label('Department', 'department'); ?></th>
       <th scope="row"><?php
                            $options = array();
                            foreach($departs as $option){
                                $options = array('option' => $option['names'],
                                                 'value' => $option['id']);
                                
                            }
                            //$options = $tmp;
                            echo form_dropdown('departments', $options, ''); ?></th>
   <tr>
     <th colspan="2" scope="row"><?php echo form_submit('submit', 'Add College Office') ?></th>
   </tr>
 </table>
 
<?php echo form_close(); ?>
</div>

When I run the code the dropbox only shows the first Department and its id from the database