how to add onchange event on dropdown in angular ?

could you please tell me how to add onchange event on dropdown in angular ? I made a simple demo in which initially I fetch bank names and show in drop down . Now I want to add on change event on that dropdown .In other words I want to which bank user select . Using that bank name I want to get state names

here is my code https://stackblitz.com/edit/angular-batt5c

<select class='select-option'
(ngModelChange)='onOptionsSelected($event)'>
<option class='option'
*ngFor='let option of dropDownData'
[value]="option.seo_val">{{option.text_val}}</option>
</select>

onOptionsSelected(){
console.log('===');
// send selected value
this.seletedValue.emit('');
}

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