1. The earliest washing machines were created in 1797. 2. They looked a lot like giant wooden boxes. 3. The first step to washing clothes was to fill the box with soap and water. 4. Next, a huge cumbersome crank had to be turned manually. Which sentence contains coordinate adjectives that should be separated by a comma?

A) sentence 1
B) sentence 2
C) sentence 3
D) sentence 4