Final answer:
Children are socialized by parents, mass media, and schools through teaching them about the world and shaping their beliefs and values. Hence, d) is correct.
Step-by-step explanation:
The agents of socialization that play a role in children's socialization include parents, mass media, and schools.
Parents are the earliest and most influential agents of socialization as they teach children what they need to know about the world.
Mass media, such as television, movies, and the internet, also play a significant role in shaping children's beliefs and values.
Schools provide a standardized curriculum as well as a hidden curriculum that helps children develop social skills and prepare for the workforce.