get Element by attribute using querySelector

const selectedOption = event.target.querySelector(
    `option[value="${selectAwardDetailCategory.value}"]`,
  );

• value="값" => don't forget (double)quotation marks

reference

• https://stackoverflow.com/questions/2694640/find-an-element-in-dom-based-on-an-attribute-value
• https://developer.mozilla.org/en-US/docs/Web/API/Element/querySelector