Since gatos is a masculine plural noun that means cats, then we need to choose a number that is more than one. From the options, we can see that the only option that meets this requirement is tres because this translates into three. Finally, we can write and translate this sentence as follows:
<em>Hay </em><em>tres </em><em>gatos en la casa (There are</em><em> three</em><em> cats in the house)</em>
