Birth rate is defined as:

• A. The rate at which births occur per year
• B. The total fertility rate
• C. The rate at which individuals produce offspring
• D. The proportion of births that are male

Answer: (C)

Birth rate is about how quickly a population adds new individuals through reproduction. It focuses on the speed at which individuals produce offspring over a given time. That’s why the best way to capture the idea is the rate at which individuals produce offspring—it's a measure of reproductive output per person per unit time.

The other ideas describe different things: counting births per year can be useful but is a population-level tally that depends on population size; the total fertility rate estimates how many children a woman would have over her lifetime, not how fast births occur now; and the proportion of births that are male refers to the sex ratio at birth, not the rate of birth events.