If you are told the results of a hypothesis test are "statistically significant at the alpha = 0.05 (or 5%) level," what does that mean?

If you are told the results of a hypothesis test are "statistically significant at the alpha = 0.05 (or 5%) level," what does that mean? 

A)The null hypothesis is true.

B)The alternative hypothesis is true.

C)The p-value is less than or equal to 0.05.

D)The p-value is larger than 0.05.