After 16 years in power, Angela Merkel, the chancellor of Germany, is walking out of office one of the most popular politicians in the country. In those years, Ms. Merkel has not only served as the leader of Germany, but also as a leader of Europe, facing down huge challenges — such as the eurozone and the refugee crises — all while providing a sense of stability. As Germans head to the polls this weekend, the question is: who can lead Germany and Europe at a time when the world faces no fewer crises? Guest: Katrin Bennhold, the Berlin bureau chief for The New York Times.