参考答案

正确答案：C
解析：细节题型见第三段第二句：Since big families are often seen as safety nets for illness and old age， improving poor people's access to insurance，pensions and welfare institutions also has a major impact. (大家庭常被认作是防病、防老的安全港；改善贫困人口获得保险、养老金及其它福利机制的途径也会有着很大的影响)；这就是说为妇女提供应对各种困难的防护对妇女少生孩子会有很大作用，因此C为答案。