Hoy no es domingo. Hope it helped.
C.<span>El teclado está al lado del ratón</span>
Elena : My friends are the United States also (also) ___ They're from California.
I assume : My friends are from the United States also US. They're from California.
Answer: b. US
translation Mis amigos son de los Estados Unidos, también U.S. Ellos son de California.
Hope this helps!