Phillip Morris USA,the Manufacturer of Marlboro Ultra Smooth Cigarette Targeted

Phillip Morris USA,the manufacturer of Marlboro Ultra Smooth cigarette targeted to people who want to smoke a potentially safer cigarette has asked for marketing research to explain the reasons for the recent failure of the new cigarette.This type of research is described as:

A) descriptive
B) predictive
C) diagnostic
D) normative
E) historical