A new app lets you connect to a webcam at your front door allowing property owners to speak with visitors virtually. There are 4 different versions of the device that were tested in a focus group. After trying out each for 3 months a sample of 18 families chose the best design 'Video Door Bell'. 

Peepers     4

VideoEye   4

DoorMan    7

SafetyEye  3

Run a test to find if one design may be better or worse according to consumers in the focus group. Choose the best answer or summary.

A. If an equal proportion preferred each, I'd expect to see 4 who preferred Doorman but in actuality 7 preferred Doorman. More than expected prefer Doorman. Use Doorman rather than the others.

B. An equal proportion prefer each type of video door bell; Don't spend more on one versus the other on based upon focus group preferences.

C. The underlying assumption of the test is not met so no valid summary and recommendation can be made.

D. TNOETS preferences differ across Video Door Bells, do not spend more on one vs the other.