What are the main arguments the Catholic Church uses in support of the sole interpretive authority of the Magisterium?

According to the Catechism (CCC 100 ) > "The task of interpreting the Word of God authentically has been > entrusted solely to the Magisterium of the Church, that is, to the > Pope and to the bishops in communion with him." What arguments does the Catholic Church use to support the idea that "the task of interpreting" has been entrusted **solely** to the Magisterium of the Pope and bishops in communion with him?