If li contains text : apply change to specific div in the same li not all

I have a list, each with a button, and a price. I am able to find the button that says "choose options", and then apply a change to another div, however, it changes that div for all LIs, and not just the one where the button text occurs. How do I contain the change to only the relevant LI?

<ul>
    <li>
        <em class="p-price">$1.95</em>
        <div class="ProductActionAdd">
            <a href="" class="btn">Add To Cart</a>
        </div>
    </li>
    <li>
        <em class="p-price">$4.95</em>
        <div class="ProductActionAdd">
            <a href="" class="btn">Choose Options</a>
        </div>
    </li>
    <li>
        <em class="p-price">$5.95</em>
        <div class="ProductActionAdd">
            <a href="" class="btn">Add To Cart</a>
        </div>
    </li>
</ul>

<script>
if ($('ul li:contains("Choose Options")')) {
    $(".p-price").prepend("STARTING AT: ");
}
</script>

The Script above does find the "choose options" text. But then it adds "Starting At: " to all .p-price instances. How do I have it only change the .p-price in the same LI? So that the LIs that have "add to cart" button, don't get the text insert before the price?

I've read about .each(), return false, and looping, but not sure If I'm barking up the correct tree, as I've tried various code iterations that fail horribly, but when it comes to this specific if contains, change another div, I cannot find anything that comes close.

I would greatly appreciate any advice on how to do something like this, but keep it isolated to the current li. Thank you tremendously!