Respuesta :
i think its an activist. i had the same question on the test. hope i helped.
The correct answer is AN ACTIVIST.
The answer is activist because of the meaning which the journalist gives to his works: he is trying to change the world and iinprove the lives of others with his writing.
The Cambridge Dictionary provides the meaning of ACTIVIST:
a person who strongly believes in political or social change and takes part in activities to bring his believes to reality.