Match the following columns

Column I	Column II
a. Personal contact	1. Mass method
b. Public address equipment	2. Mass method
c. Circular letter	3. Individual method
d. Television	4. Group method

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

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

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

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

Answer: Option A