<em>no entiendo perdon por no poder ayudarte :(</em>
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
I think the answer is C. to preserve the language and heritage of the community.
Uso un “x”, un punto, o solo (). La palabra multiplicación en inglés es “multiplication”
La tienda would be the correct answer.