A Retail Catalog Company Wants to Perform a Work Sampling

A retail catalog company wants to perform a work sampling study of its call center,and if the company estimates its operators are busy answering calls 80% of the time,and it wants the study to be accurate with + or - 4% with a 95% degree of accuracy,the number of sample observations the study should include is approximately

A) 8
B) 49
C) 384
D) 2,401