Both say “it’s their store” it just depends whether you are talking about one or more people. Su is usually he/she but it can mean they/it if you are being non-gender specific. Personally I would go for Es sus tienda but I’m not a native Spanish speaker so I could be wrong
<span>Dossier solve the manuscript of the second source</span>
I would assume carpeta because it ends in a I’m not sure tho.
