According to the Text,how Many (If Any)of the Following Situations

According to the text,how many (if any) of the following situations are an appropriate use of focus groups?
- determining the percentage of individuals who use a particular product
- exploring reactions to current approaches to brand and category advertising
- determining if there are statistical differences in attitudes between groups of consumers
- developing and refining hypotheses regarding consumer motivations

A) 0
B) 1
C) 2
D) 3
E) 4