how select select input value automatically in select input?

I am working with laravel and in my form I am grab data to select input using some variable,

<label for="exampleFormControlSelect1">Vehicle Category</label>
        <select name="c_id" id="c_id" class="form-control input dynamic" data-dependent="b_id" >

            @foreach($model_list as $model) 
            <option value=""></option>
            @endforeach


        </select>

now I am going to hide this select input and this select input is depend to other select inputs values. so, I need select automatically drop down values to above select input using some technology. how can I do this? (currently it should select manually using drop down list)

via Chebli Mohamed