Sales dropped 30 percent from last quarter, but no one can agree on why it happened. Some think it must be a new competitor in the market, some think it was an ill-advised change in the promotional message, some blame short staffing in customer support. What kind of market research should you engage in to find out what factor is behind the sales drop?

Group of answer choices

Causal

Descriptive

Close-ended

Open-ended

Exploratory