At Least Once a Month, I Get Calls from Individuals

At least once a month, I get calls from individuals doing marketing surveys. They frequently claim that the survey will take "just a minute or two." However, I inevitably find that, once committed in this fashion I am still answering questions 10-20 minutes later. According to the advice given in Influence, the next time I get such a call, which of the following should I feel justified in doing? I should:

A) tell the caller when the agreed-upon time has run out and end the call.
B) ask to speak to the caller's supervisor and complain if pressed by the caller to continue beyond the agreed-upon time.
C) call the Better Business Bureau to advise them of the caller's company name and tactics.
D) all of the above.