Match the following columns

Column I	Column II
a. Mass contact	1. Bulletin
b. Group contact	2. Method demonstration
c. Individual method	3. Symposium
d. Individual method	4. Result demonstration

A. a-1, b-3, c-4, d-2

B. a-2, b-3, c-4, d-1

C. a-4, b-3, c-2, d-1

D. a-1, b-2, c-3, d-4

Answer: Option D