Your text discussed a well-publicized study showing a positive correlation between young children sleeping with a nightlight and the children later becoming nearsighted to illustrate the point that:

a. correlations greater that +50.00 are easier to interpret than those less than +50.00
b. small changes in children's environments can often have substantial changes in children's preferences (e.g., whether they read just for fun)
c. the same environmental stimuli that can have a large effect on children younger than 3 often have no effect on children older than 5.
d. seemingly straightforward causal inferences of causation based on correlational data often prove to be wrong

Ans: d. seemingly straightforward causal inferences of causation based on correlational data often prove to be wrong