What Problem Has Been Created for Survey Researchers as More

What problem has been created for survey researchers as more Americans have cut their reliance on landlines, now using only cell phones?

A) It is now more difficult to draw a sample that is random.
B) It is now more difficult to build intensity measures into responses.
C) It is now more difficult to place repeated callbacks.
D) It is now more difficult to cluster interviews geographically.
E) It is now more difficult to process response data.

Correct Answer:

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