The first bicycles, built in the early nineteenth century, had no pedals; riders pushed themselves along with their feet. Pedals were added to the front wheel in the 1860s, but these machines were heavy and uncomfortable. In the 1880s, the "safety bicycle" appeared, with two wheels of equal size and a chain driving the rear wheel. It was easier to ride and quickly became popular. Many historians believe it helped change society by giving ordinary people, including women, a cheap way to travel independently.

Answer and explanation

Correct answer: D. Equal wheels and a chain drive

  1. Step 1: The passage says it had two wheels of equal size and a chain on the rear wheel.
  2. Step 2: This made it easier to ride.
Answer
Equal wheels and a chain drive.
Why not the others: A large front wheel, no chain and front pedals describe earlier designs.

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