Which practice of the Catholic Church is Martin Luther criticizing in the passage? O requiring tithes
o practicing simony
O selling indulgences
O preaching predestination

selling indulgences

Explanation:

Luther was most opposed to the idea of people absolving sins through indulgences. Indulgences are payments people make to the church that forgives all sins and "guarantees" their path to heaven. Luther wrote about how this was wrong in the 95 theses as it went against what God said.

the tallest building in the western hemisphere and the sixth tallest building in the world

this is a good question! i'll do some research and come back when i have the answer!