A study was done on the batting averages for two baseball players: Hitmore and Bunter. Data were collected over a period of time for baseball parks that are natural and artificial turf. It was found that Hitmore does better overall (i.e., has a better batting average). However, for both natural and artificial turf separately, Bunter does better.

Which of the following is correct?

This is an example of a negative association between variables.This is an example of Simpson's Paradox."Turf" is a lurking variable in this example.Both (B) and (C) are correct.This situation is mathematically impossible.