Which of the following did martin luther oppose? a. political involvement by catholic clergy b. the belief that salvation was dependent on faith c. challenges to the church's authority d. refusal by the church to practice the holy sacraments

D the refusal by the church to practice the holy sacraments

The answer is option D.

Explanation:

From about Religion site, the Seven Sacraments: The seven ceremonies Baptism, Confirmation, Holy Communion, Confession, Marriage, Holy Orders, and the Anointing of the Sick are the life of the Catholic Church.The holy observances are hallowed customs, established (or possibly affirmed) by Jesus, in which God's beauty is imparted by the Holy Spirit. The seven ceremonies are submersion, admission, Eucharist, affirmation, marriage, appointment, and blessing of the wiped out. Each of these is essential in themselves

the correct answer is b, "fertility rates are increasing, so populations will grow more quickly in the future."