In Which of the Following Situations Would Test Marketing Be

In which of the following situations would test marketing be the most appropriate method of marketing research?

A) McDonald's wants to see how people feel about its increased use of more biodegradable food wrappers.
B) The manufacturer of Tone bar soap wants to know consumer response to Tone body wash.
C) A mall wants to know what customers think of its extended hours.
D) A movie theater wants to know if people like the reduced price tickets for afternoon shows.
E) A concert promoter wants to estimate how many people will attend a SheDaisy concert.