Please also Identify the null hypothesis which is part D if this question

A certain drug is used to treat asthma. In a clinical trial of the drug, 27 of 281 treated subjects experienced headaches (based on data from the manufacturer). The accompanying calculator display shows results from a test of the claim that less than 11% of treated 1-PropZTest subjects experienced headaches. Use the normal distribution as an approximation to the binomial distribution and assume a 0.01 prop