Stats help! is the answer b? please explain why for answer! thank you

A local tennis proshop strings tennis rackets at the tension (pounds per square inch) requested by the customer. Recently a customer made a claim that the proshop consistently strings rackets at lower tensions, on average. than requested. To support this claimI the customer asked the pro shop to string 12 new rackets at 60 psi. Upon receiving the rackets. the customer measured the tension of each and calculated the following summary statistics: = 53 psiI s = 3.5 psi. In order to conduct the test. the customer selected a signicance level of o: = 0.01. Interpret this value. 0 A. The smallest value of at that you can use and still reject H0 is 0.01. O B. The probability of concluding that the true mean is less than 60 psi when in fact it is equal to 50 psi is only 0.01. O C. There is a 1% chance that the sample will be biased. O D. The probability of making a Type II error is 0.99