Question

They will live in California. Viviré en California. Vivirás en California. Vivirán en California. Vivirá en California

Answer 1

The answer is

(They- Ellos) Vivirán en California.

In Spanish the pronoun (they: ellos ) could be ommited.

According to the conjugation of the verb (vivirán) it correspond to the pronoun Ellos.

Answer 2

Viviran en Calfornia