Which of the Following Was Not Mentioned in the Discussion

Which of the following was not mentioned in the discussion of why it has become increasingly popular to use mixed-mode surveys in recent years?

A) They are more popular due to efficiencies of computer-administered methods and the communication preferences of respondents.
B) Not everyone prefers to do online surveys.
C) Some people are more comfortable with face-to-face or telephone interviews.
D) A mixed-mode survey seeks to increase the number of respondents in the survey by tapping into these communication proclivities.
E) Mixed-mode surveys don't have the concern of disadvantages that the other survey modes do.