Which of the following is the best example of correlation not being the same as causation?

A.

During an economic downturn, a company changes its computer policy to only allow purchases of windows-based laptops and see profits go down. The company concludes that windows-based laptops cause profits to go down.

B.

A company pays sales employees more for each sale and each employee starts selling more goods. The company concludes that paying employees more for a sale causes employees to sell more items.

C.

A company redesigns a production process and afterwards it takes less time to produce products. The company concludes that redesigning processes causes production efficiency gains.

D.

After a poorly performing quarter, a company sends out coupons in the mail and sees an increase in sales. The company concludes that sending coupons causes sales to increase.