You Hypothesize That More Natural Gas Is Sold in the Northeast

You hypothesize that more natural gas is sold in the Northeast when winters are colder. Which of the following possibilities would best reveal if your belief is correct?

A) A scatter- diagram plotting the average temperature in the Northeast against the amount of natural gas sold.
B) A trend diagram that plots the trend in natural gas sales over the last 30 years against the average temperature in the Northeast 30 years ago and this year.
C) A time- series diagram showing the amount of natural gas sold in the Northeast during the last 30 years.
D) A time- series diagram showing the average temperature in the Northeast during the last 30 years.