파아랑 님 답변 참고해 jquery 코드 짜봤는데.... 채택완료

</p>

<p><script src="<a href="https://code.jquery.com/jquery-latest.js"></script>" target="_blank" rel="noopener noreferrer">https://code.jquery.com/jquery-latest.js"></script></a></p>

<p><input type="radio" class="abc" name="abc" value='a'> a

<input type="radio" class="abc" name="abc" value='b'> b

<input type="radio" class="abc" name="abc" value='c'> c</p>

<p><div class="box">

  <img src="<a href="https://i.imgur.com/PQNhCln.gif"" target="_blank" rel="noopener noreferrer">https://i.imgur.com/PQNhCln.gif"</a> class='hz'>  

</div></p>

<p><script>

$(".abc").click(funtion(){

    if($(this).attr("value")=="a"){

        $(".hz").attr("src","<a href="https://i.imgur.com/PQNhCln.gif");" target="_blank" rel="noopener noreferrer">https://i.imgur.com/PQNhCln.gif");</a></p>

<p>    }

    if($(this).attr("value")=="b"){

        $(".hz").attr("src","<a href="https://i.imgur.com/YrkG5xB.gif");" target="_blank" rel="noopener noreferrer">https://i.imgur.com/YrkG5xB.gif");</a></p>

<p>    }

    if($(this).attr("value")=="c"){

        $(".hz").attr("src","<a href="https://i.imgur.com/3h0LOk9.gif");" target="_blank" rel="noopener noreferrer">https://i.imgur.com/3h0LOk9.gif");</a>

    }

});

</script></p>

<p>