Need Help in the following multiple choice select the correct

Ophelia O'Brien, Director of Consumer Credit with Auckland First Bank (AFB), monitors the default rate on personal loans at AFB member banks. One of her standards is 'no more than 5% of personal loans should be in default'. Each Friday, the default rate is calculated for a sample of 500 personal loans. Last Friday's sample contained 30 defaulted loans. Ophelia's null hypothesis is Select one: O a. n = 30 O b. n = 500 O c. p > 0.05 O d. p s 0.05