Final answer:
Mail surveys have the lowest return rate and limited flexibility compared to face-to-face, telephone, and internet surveys.
Step-by-step explanation:
The survey method that has the lowest return rate and does not allow for much flexibility is mail surveys
. Many people do not respond to mail surveys, and it is difficult to determine who is responding. Additionally, mailing lists can be incomplete. On the other hand,
face-to-face
,
telephone
, and
internet
surveys offer more flexibility and typically have higher response rates.