Which of the following statements is NOT a null hypothesis?

A) Men and women have equivalent driving skills.

B) There is no relationship between age and mathematical skills.

C) Alcohol reduces inhibitions. <---I think it's this one?

D) Marijuana has no effect on motivation.

Jason wanted to study the affect of drinking on test performance. He assigned one group of people to have a beer before writing a test and another group to have a glass of water before writing the same test. When Jason analyzed his data, he found his results were significant at an alpha level of < 5%. What does this mean?

A) The probability that the groups are different is less than 5%.

B) The probability that the groups are the same is less than 5%. <--I think its this one

C) Jason should not reject the null hypothesis.

D) There was a large effect between the two groups.