If a Difference Seen in Sample Results Is "Statistically Significant"it

If a difference seen in sample results is "statistically significant"it means that

A) there is an important difference in the sample results.
B) there is an important difference in the population.
C) the difference observed in the sample was unlikely to have occurred if there is no difference in the population.
D) there is an important difference in the population that wasn't reflected in the sample results.