Explanation:
A participial phrase is the (usually) not needed information.
Mary, <u>who is the prettiest girl I have ever seen,</u> likes to practice ballet in the yard.
Participial phrases move around in sentences. Be aware.
<u>Riding around the block</u>, Carly set her eyes upon a little candy shop.
The participial phrases have to be around their subject, though.
Answer: stealers