B. The main difference between Edward and Tom lies ... 1) in the cities where they live. 2) in the way the look. 3) in the families they live in. 4) in the centuries they lived in.

Решение:

В тексте говорится, что Том Кэнти родился в бедной лондонской семье, а принц Эдвард — сын короля Генриха VIII. Это основное различие в их происхождении и семьях.

"The Prince and the Pauper" begins on an autumn day in London in the 16th century. Two boys are born. The first is Tom Canty, a child born to a poor London family. The second is Edward Tudor, Henry VIII's son and the future king of England.

Ответ: 3) in the families they live in.