Which sentences from the passage develop the central idea that prices vary over time as well as from place to place? Select each correct answer.

"Even with different tax costs, however, sometimes the difference in price between two places is hard to explain."

"Slowly but surely, the demand for cheaper garden hoses is spreading throughout Germany, and the phrase “getting hosed” no longer has two meanings."

"In the United States, states need to make money to help pay for the services they provide."

"If you go to a store in the United States to buy a garden hose, the prices will also vary, but the parts will probably come attached."

"As more people gain Internet access, they’re researching item prices in other countries."