Answer: Estoy al lado de la alfombra, image: Person by or next to a rug, vacuuming it.
Al lado means next to, or besides something. We know this is the correct answer because one image shows a person next to the rug, and the other image shows a person on the rug.
Therefore, the answer with the image of the person by or next to a rug fits "estoy al lado de la alfombra"
Proof of validity is shown below.