Kelsey Has to Design a Research Study to Assess the Impact

Kelsey has to design a research study to assess the impact of the Internet and mobile applications on work efficiency among all employees of her company.This study will help Kelsey's marketing team decide whether to promote new work tools via mobile applications.She uses a simple random sampling technique to identify her research participants.Kelsey uses a computer software program to randomize the names of the 500 employees of the company and selects 300 to participate in the study.Over the course of one month,study participants are asked to complete a concise questionnaire with five questions followed by a personal interview with a company executive. Which of the following is a drawback of this research design? ​

A) ​The sample is too small.
B) ​The study lacks confidentiality.
C) ​The questionnaire used is not clear.
D) ​Focus groups can be time-consuming.
E) ​Researchers did not have enough time to expedite the study.