Concept:
Demography is the statistical study of human population.
It studies population size, structure, distribution, and changes over time.
Step 1: Understand demographic indicators.
Demographic indicators help measure population characteristics such as:
• Population growth
• Birth and death rates
• Migration
• Fertility
• Mortality
Step 2: Examine the given statements.
• Climate -- Not a demographic indicator
• Migration -- Demographic indicator
• Fertility and mortality rates -- Demographic indicators
• Crude birth and death rates -- Demographic indicators
• Exim rate -- Related to trade, not demography
Step 3: Identify the correct indicators.
The correct demographic indicators are:
\[
B, C, D
\]
Step 4: Match with the options.
The correct option is:
\[
\boxed{\text{B, C, D Only}}
\]