Abe was making s'mores. He put his marshmallows on a plate in $2$ rows with $3$ marshmallows in each row. https://cdn.kastatic.org/ka-perseus-graphie/9645db4e27a7084d9712ad940aa0ef1d564446b9.svg Which expression could we use to find the total number of marshmallows Abe has for making s'mores?