Which Statement Is Not True Concerning a Standard Test Market

Which statement is not true concerning a standard test market?

A) One or more combinations of marketing mix variables (product, price, distribution, and promotional levels) are employed.
B) Competitors often take actions such as increasing their promotional efforts to contaminate the test marketing program.
C) While a firm's test marketing is in progress, competitors have an opportunity to beat it to the national market.
D) All statements are correct.