What is the meaning of birth rate?

Correct answer: Number of births per thousand population in a year

Direct answer: A, the number of births per thousand population in a year. Birth rate is a demographic measure used to compare births in places or periods with different population sizes. First identify the births occurring during one year. Then relate that number to the population and express the comparison per 1,000 people. Option A is correct because it includes the time period, births, population base and per-thousand unit. Option B is wrong because mountains are physical features and are not used to measure births. Option C is wrong because rivers are geographical features, not a population rate. Option D is wrong because migrants are people who move into or out of an area; they are not the babies counted in the birth rate. A simple form is: birth rate = births in one year ÷ population × 1,000. Memory cue: birth rate means births per thousand people per year.