If family planning succeeds in an area but death rate also falls, how should growth be analysed?

Correct answer: Check the combined effect of falling birth rate and falling death rate

Direct answer: B, examine the combined effect of both falling rates. Population growth depends on the relationship between births and deaths. Successful family planning generally lowers the birth rate, so fewer people are added naturally. A falling death rate works in the opposite direction: fewer people die, so more people remain in the population. To judge the final growth, compare the size and timing of both changes; do not assume that one factor alone determines the result. A is incomplete because birth rate is only one part of natural change. C is wrong because a lower death rate can substantially increase or maintain growth. D confuses migration with births; migration changes population through people entering or leaving, not through the birth rate. Memory cue: natural increase equals births minus deaths, while total change also considers migration.