Which of the Following Is a Difference Between Structured Interviews

Which of the following is a difference between structured interviews and unstructured interviews? 

A)  ​In structured interviews, interviewers prepare standardized interview questions ahead of time; whereas, in unstructured interviews, interviewers are free to ask applicants anything they want. 
B)  ​In structured interviews, interviewers tend to ask applicants personal questions; whereas, in unstructured interviews, interviewers ask only for important, job-related information.  
C)  ​In structured interviews, interviewers often disagree about which questions should be asked; whereas, in unstructured interviews, interviewers strongly agree that the same questions must be asked to all applicants. 
D)  ​In structured interviews, employers are unable to compare applicants; whereas, in unstructured interviews, employers are able to compare applicants since all applicants are asked the same questions.