Family planning is directly related to what?

Correct answer: Birth rate

Direct answer: Option B, birth rate. Family planning helps individuals and couples decide the number and spacing of children, usually through information, counseling, and access to appropriate reproductive-health services. Because it affects the timing and number of births, its direct population connection is with the birth rate. Option A is wrong because family planning has no relationship with the direction in which rivers flow. Option B is correct because fewer or more births over a period can change the birth rate, and family planning is concerned with reproductive decisions. Option C is wrong because the height of mountains is a physical geographical feature that family planning cannot alter. Option D is wrong because weather forecasting concerns atmospheric conditions, not births. Family planning does not by itself determine the total population change: deaths and migration also matter. Memory cue: family planning concerns planned families and therefore connects first with births and birth rate, not with landforms or weather.