Which sentence has a capitalization error?

Responses

The jazz age was a decade of excess after the horrors of World War I.
The jazz age was a decade of excess after the horrors of World War I.

During the Middle Ages, the bubonic plague killed almost 40% of the population in Europe.
During the Middle Ages, the bubonic plague killed almost 40% of the population in Europe.

Colonists’ resentment about paying taxes led to a revolution that changed the world.
Colonists’ resentment about paying taxes led to a revolution that changed the world.

Lake Victoria is the largest lake in Africa and is a fresh-water lake.

Lake Victoria is the largest lake in Africa and is a fresh-water lake.