We need to weaken the conjecture, creativity is no longer limited by intelligence above a specific IQ level. So if we can find something that shows that intelligence and creativity are related for all levels of IQ level, in other words, if we can show that there is no threshold above which creativity/intelligence relationship breaks than we would weaken the conjecture.
A) It gives info about correlation among creativity measures at PARTICULAR IQ level. So this statement doesn't tell anything about creativity/intelligence relationship
B) Out of topic, since we don't care about tests, we care about the relationship between creativity and intelligence
C) Tempting, because as students progress to higher levels their IQ is expected to rise and the statement provides info about positive correlation. But, one might argue that even high school students' IQ levels are well below the threshold level, above which the relationship breaks.
D) It is similar to C. The results are different for IQ 120, but we don't know that IQ 120 is the threshold level, above which there is no relationship. If the threshold level is 150, then one might argue that above IQ 150, the relationship breaks.
E) The answer shows a linear trend between creativity and intelligence. It is the correct answer, because if there were some kind of threshold, then the scatter plot would reflect this (no relationship part of the plot should be a horizontal line, which is not a linear relation)