Dairy Farmers of Canada Discovered That Milk Consumption in the Country

Dairy Farmers of Canada discovered that milk consumption in the country was declining.They conducted research to understand the reasons for the declining consumption of milk.They discovered that the decline was due to the perception that milk was fattening and high in cholesterol.The association determined the demographic characteristics of milk consumers, their attitudes toward milk, and their usage patterns.The association carried out a television advertising campaign that portrayed that milk was an essential element in a healthy diet.Later, they discovered that the campaign helped change customer attitudes toward milk consumption, hence increasing sales. Which of the following types of research would have helped the Dairy Farmers of Canada assess the effect of the television advertising campaign on milk consumption?

A) exploratory research
B) preliminary research
C) causal research
D) ethnographic research