Arrange the different kinds of roles played by advertising agencies in correct chronological order.
1. Research on the company, products and reactions of the customers.
2. Market planning.
3. Production of creative materials.
4. Planning for the type of media to be used.

A. 1, 2, 3, 4

B. 4, 3, 2, 1

C. 2, 4, 1, 3

D. 3, 1, 4, 2

Answer: Option A