How to align a span and a div on the same line

How to align a span and a div on the same line

I have the following HTML:
<div class="parent">
<div class="holder">
    <span class="holder_under">Left heading</span>
    <div class="holder_options">
        <span class="holder_options_1">Option 1</span>
        <span class="holder_options_2">Option 2</span>
        <span class="holder_options_3">Option 3</span>
    </div>
</div>
</div>
CSS:
.holder {
    background-color: blue;
    padding: 10px;
}
.holder_under {
    padding-left: 10px;
    font-size: 16px;
    color: #999;
}
.parent {
float: left;
margin-right: 20px;
width: 600px;
}
How do I make holder_options align in the same line as .holder_under? I updated the question with a div i forgot to add.