How many tissues should a package of tissues contain?

Researchers have determined that a person uses an average of 69 tissues during a cold. Suppose a random sample of 2500 people yielded the following data on the number of tissues used during a cold: x = 60, s = 16. Suppose the corresponding test statistic falls in the rejection region at a = .05. What is the correct conclusion?
Choose one answer.
a. At a = .05, reject H0
b. At a = .10, reject H0
c. At a = .05, accept Ha
d. At a = .10, reject Ha