Select on op-apartment.html template

Hi,

We are using the beautiful op-apartment.html template and we need a select field on it.

We changed this:

<div class="col-md-4 mb-4">
	<input type="text" id="template-contactform-phone" name="template-contactform-phone" value="" class="sm-form-control border-form-control" placeholder="Phone" />
</div>

<div class="col-md-8 mb-4">
	<input type="text" id="template-contactform-subject" name="subject" value="" class="required sm-form-control border-form-control" placeholder="Subject" />
</div>

To this:

<div class="col-md-4 mb-4">
	<input type="text" id="template-contactform-telefone" name="template-contactform-telefone" value="" class="sm-form-control border-form-control" placeholder="Telefone" />
</div>

<div class="col-md-4 mb-4">
	<input type="text" id="template-contactform-assunto" name="subject" value="" class="required sm-form-control border-form-control" placeholder="Assunto" />
</div>

<div class="col-md-4 mb-4">
	<select id="template-contactform-select" name="template-contactform-select" class="sm-form-control border-form-control" />
	<option value="">Choose</option>
	<option value="A">A</option>
	<option value="B">B</option>
	<option value="C">C</option>
</select>
</div>

Is it possible to write a placeholder on select field?
Is it possible to make the select field required?

Thank you!

Thank you!