A、By spending less on health care. B、By feeding less people. C、By having more work labors. D、By receiving more donations. A短文开头说

(23)A new report says greater access to family planning methods would save developing countries more than eleven billion dollars a year. The United Nations Population Fund says the savings would come from reduced costs of care for mothers and newborn babies. These are some of the findings from this year’s " State of World Population" report. The report says increased access to family planning is a good economic investment. Having fewer children has long paid a so-called demographic dividend to rich countries in Europe and North America. Population Fund spokeswoman Diane Stewart says one-third of the growth of Asia’s " tiger" economies is the result of increased use of family planning services.
    Sub-Saharan Africa has some of the biggest unmet needs for family planning services. The report says modern contraceptives are not widely available in countries such as Chad and Niger. But Ms. Stewart says providing contraceptives in developing countries is not enough. There are social, political and legal barriers that prevent access to birth control.(24)In many cultures, women are encouraged to have large families and to avoid or limit the use of contraceptives.
    The Population Fund says family planning helps countries reduce poverty. A recent study said Nigeria’s economy would grow by at least thirty billion dollars if the fertility rate fell by just one child per woman in the next twenty years. Ms. Stewart says family planning is a global challenge.(25)She says studies show that abortion rates fall in countries where people have access to modern methods of family planning.
23. How can developing countries save money by applying family planning methods better?
24. Why is it difficult to improve family planning services in Africa?
25. What happens in countries with good access to family planning methods?