Getting a specific product variant price based on selected options

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Is there a way to find a specific product variant by inputting the productId and the currently selected options? Here’s what happens when the customer clicks on an option:

$w ( ‘#waterpumpSelectionRepeater’ ). onItemReady (( $item , itemData , index ) => {
$item ( ‘#selectWaterPumpButton’ ). onClick (() => {
selectChoiceForOption ( $item , ‘Water Pump’ , itemData );

        changePriceText (); 

        //on mobile, make all repeaters collapsed 
        **if**  ( wixWindow . formFactor  ===  'Mobile' ) { 
            toggleFold ( 5 ); 
        } 
    }); 
})

function changePriceText ( ){
product . getVariants ( productId , selectedOptions ). then (( variantItem ) => {
let varPrice = variantItem [ 0 ]. variant . formattedPrice ;
$w ( ‘#pricetext’ ). text = varPrice . toLocaleString ();
});
}

Right now, the price text will change to whichever variant matches the index variantItem[x]. How do I make it so that this product variant reference correlates with the product options the customer has selected?