Match the following columns

Column I	Column II
a. The simplest method of interpolation is	1. dx/tx
b. In life table qx is calculated by formula	2. Graphic method
c. Vital index is the index of two vital statistics	3. 0 to 5
d. Theoritically the net reproduction rate can range from	4. Births and deaths

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

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

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

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

Answer: Option D