Highlights some <p> class

Highlights some <p> class

Hi guys, im new in jquery but im trying my best. 
Here's the problem, i have this "formulary" with some questions i made with <select> and its working fine.
but i need to highlight some paragraph on the text when the guy marks the correct option.

heres some part of the structure( if you want i'll put the whole thing) 


<p>   text    text    text    text   <p class="class1"> TEXT I NEED TO HIGHLIGHT WHEN DUDE SELECT'S RIGHT OPTION <p>    text    text    text    <p>

function verificaQuestao1(){
resetaAlternativaQuestoes1();
<!-- Letra A -->
if($('#questao1_a').val()==4 ){         //if OPTION IS CORRECT
mudaCorTextoParagrafo("#q1Alt_a","green",20);   //changes color to green
$("#q1SimbCerto_a").show();                      // shows correct .jpg
$("#q1SimbErrado_a").hide();                   //dont care
                         //HERE IS THE PART I SHOULD HIGHLIGHT SOME SPECIFIC <P ="CLASS> 
}
else{
mudaCorTextoParagrafo("#q1Alt_a","red",20);
$("#q1SimbCerto_a").hide();
$("#q1SimbErrado_a").show();