Edit in JSFiddle

<p>Select country/ region:</p>

<select onchange="switchVis(this.value)">
  <option value="yyMLc">Europe</option>
	<option value="abGt8">Spain</option>
	<option value="3WjSo">Germany</option>
	<option value="FyNK8">Italy</option>
	<option value="CjYNR">UK</option>
	<option value="WYEA7">France</option>
</select>


<iframe title="New confirmed COVID–19 cases, deaths &amp;amp; recoveries in Europe, per day" aria-label="Interactive line chart" id="datawrapper-chart-vq9AT" src="https://datawrapper.dwcdn.net/yyMLc/" scrolling="no" frameborder="0" style="width: 0; min-width: 100% !important; border: none;" height="407"></iframe>

<script type="text/javascript">!function(){"use strict";window.addEventListener("message",(function(a){if(void 0!==a.data["datawrapper-height"])for(var e in a.data["datawrapper-height"]){var t=document.getElementById("datawrapper-chart-"+e)||document.querySelector("iframe[src*='"+e+"']");t&&(t.style.height=a.data["datawrapper-height"][e]+"px")}}))}();
</script>

iframe {
  margin-top: 20px;
  width: 400px;
}

function switchVis(chartId) {
  document.querySelector('iframe').src = 'https://datawrapper.dwcdn.net/' + chartId;
}