An example of _____ would be a test of two different ads for Morton's salt. One ad contained ideas extending the use of salt beyond the kitchen, and the other described salt as "The Spice of Life." Both ads were run in alternative copies of the March 2003 issue of Better Homes & Gardens.
A. bipolar communications tests
B. split-run tests
C. dual copy tests
D. Flesch tests
E. tests of alpha activity
Answer: B