Hay una grande en el comedor.

a. sofá
b. horno
c. refrigerador
d. mesa

The answer is:  [D]:  "mesa" .

     "Hay una   mesa    grande en el comedor."

  Note:  "el comedor" means "dining room" in Spanish.

  The answer choices given translate to:  "sofa; oven; refrigerator, table".

     Translated:  "There is a big in the dining room."

   The only answer choice that makes sense is: "table" ; 
which is:  "Answer choice: [D]:  "mesa" .

Furthermore, we are given: "Hay una grande " ;

So, we need a feminine singular noun.

Choice "C") refrigerador ; (refrigerator). is masculine;
Choice "B") horno; (oven); is masculine; 
Choice "A") sofá (sofa/couch); is masculine;

That leaves us with:  Choice [D]: "mesa" (table);  which is feminine.

When do your brothers brush their teeth?

Thats not spanish chica thats math