Final answer:
Archbishop Lefebvre was excommunicated for his efforts to preserve the traditional Latin Mass. Martin Luther primarily protested against the sale of indulgences in the Catholic Church.
Step-by-step explanation:
Archbishop Marcel Lefebvre's fight to keep the Latin Mass and other traditions led to his excommunication in 1988. His actions were part of a larger resistance to changes within the Catholic Church that included moving away from Latin in the liturgy and embracing local languages. This was in opposition to the reforms initiated by the Second Vatican Council, which aimed at making liturgical expressions more accessible to the modern faithful.
The practice of the Catholic Church that Martin Luther protested in the Ninety-five Theses was b. the sale of indulgences. Luther was concerned that this practice allowed the wealthy to purchase their way to forgiveness, challenging the Church's taxation of ordinary people and advocating for scripture to be accessible in the vernacular language of the day.