In a Newspaper Article About Whether the Regular Use of Vitamin

In a newspaper article about whether the regular use of Vitamin C reduces the risk of getting a cold, a researcher is quoted as saying that Vitamin C performed better than placebo in an experiment, but the difference was not larger than what could be explained by chance. In statistical terms, the researcher is saying the results are _______

A) due to non-sampling errors.
B) definitely due to chance.
C) statistically significant.
D) not statistically significant.