English for resume

Which of the following statements found in a resume do not clearly demonstrate the action done?

i. Administered a variety of surveys to collect data about employees
ii. Maximised profits by 15% during the month of July
iii. Surveyed a group of postgraduates with regard to mobile usage
iv. Was the boss of a team of six service employees
v. Participated in an interior design layout activity

A. i & ii
B. iv & v
C. i,ii & iii
D. iii & iv

my answer is "B",is that correct?