Consumers from outside our experiment or test market area sometimes come into the area and purchase the product being tested. When this happens, we are likely to get

$($A$)$ process contamination

$($B$)$ biased results

$($C$)$ cannibalization

$($A$)$ only

$($A$)$ and $($B$)$ only

$($C$)$ only

$($A$),($B$),$ and $($C$)$

$($B$)$ only