It is assumed that the average number of days off per year in US is more than 30 days. An activist think that it is not true and the average number of off days is less than 30 days. She does the survey with 30 people and asks about their number of off days The population standard deviation is 10 days. The sample average becomes 25 days. What is the p-value of testing this hypothesis? O A 0.031 OB: 0.0031 O c.0069 O0.0.0069