In Bootstrap 4 you can use the form-check-inline class.
<div class="form-check form-check-inline">
<input class="form-check-input" type="radio" name="queryFieldName" id="option1" value="1">
<label class="form-check-label" for="option1">First</label>
</div>
<div class="form-check form-check-inline">
<input class="form-check-input" type="radio" name="queryFieldName" id="option2" value="2">
<label class="form-check-label" for="option2">Second</label>
</div>