NOTE: Official UPSC answer key has considered both A and C as correct.

A. By logically explaining to the residents the need for family planning to improve the health and living standards. A logical, fact-based explanation can help residents understand the benefits of family planning in terms of health, economic well-being, and overall quality of life. This can address concerns and misconceptions and provide a rational foundation for adopting family planning measures.

C. By offering incentives for adopting family planning devices. Offering incentives can provide a tangible motivation for individuals to adopt family planning measures. Incentives can be in the form of financial rewards, health benefits, or access to better services, which can encourage participation in the program, especially in areas where there is resistance.