Researchers surveyed 1,000 randomly selected adults in the u.s. a statistically significant, strong positive correlation was found between income level and the number of containers of recycling they typically collect in a week. please select the best interpretation of this result.a. We can not conclude whether earning more money causes more recycling among U.S. adults because this type of study does not allow us to infer causation. b. This sample is too small to draw any conclusions about the relationship between income level and amount of recycling for adults in the U.S. c. This result indicates that earning more money causes people to recycle more than people who earn less money.