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POST method help

Using the code from from of my *-action.html works for standard text input

<form method="POST" action="{{ url_for('controlaction') }}">   
<label for="control_input_arg1">Enter first argument:</label><br>
<input type="text" name="control_input_arg1" /><br />
<input type="submit" value='Submit Perimeters!'>

But when I try to make it into a pulldown, it doesn't work gives me a 400 error. Any clue what's going on?

                <form method="POST" action="{{ url_for('controlaction') }}">         
                  <select names="control_input_arg1">
                    <option value="" disabled="disabled"  style="display:none" selected="selected">Please select a year</option>
                    <option value="2015">2015</option>
                    <option value="2016">2016</option>
                    <option value="2017">2017</option>
                    <option value="2018">2018</option>
                    <option value="2019">2019</option>
                    <option value="2020">2020</option>
                  </select>

                  <input type="submit" value='Submit Perimeters!'>

                <select names="control_input_arg1">

                <select name="control_input_arg1">