research is research that probes systematically into the marketing problem and bases its conclusions on a large sample of participants.
a. descriptive
b. causal
c. observational
d. informative
e. analytical

Option (A)

Explanation:

The descriptive research is commonly used in order to describe the characteristics of the population or the phenomenon that is being studied. It tends to not answer the questions regarding when/how/why these characteristics have occurred. Instead it tends to address "what" of the question. These characteristics which are used in order to describe circumstances or situation or the population, usually tend to have some type of scheme i.e. categorical, which is known as the descriptive categories.

answer; (consensus);

the answerr would be 1