Which of these best states the main idea of this passage?

"did you know that the roller skate has been around since the early 1700s? people who loved winter ice-skating wanted to go "dry-landing skating" in the summer, and so they attached wheels to their boots. the early models were hard to roll, though. in the late 1800s, roller-skate design improved. once the skates were easier to handle, the sport became more popular."

a. people liked ice-skating in the winter
b. many people wanted to skate in the summer.
c. roller-skating has become a popular sport over time
d. early roller skates were difficult to use.

which is the right answer?

me ; -;