Which point prescription is most applicable for a pulse that is forceless and soft, indicating deficient yin?

The chosen point prescription highlights the importance of addressing deficient yin through selected acupuncture points that nourish and support the body's yin energy.

REN-4 (guan yuan) is a significant point for nourishing the kidneys, which play a crucial role in yin formation and management. It has a strong association with reproductive health and overall vitality, making it essential for reinforcing yin. In conjunction with this, SP-6 (san yin jiao) is a powerful point for nourishing both the yin and the blood. It not only supports the spleen's ability to produce blood—therefore indirectly aiding yin—but also enhances the kidney and liver functions, which are key in maintaining the body's nutrient balance.

Additionally, a forceless and soft pulse reflects a fundamental lack of substance, indicative of deficient yin. Therefore, the use of points that support the foundations of yin, like REN-4 and SP-6, directly addresses the underlying deficiency, aligning with the symptoms presented.

The other options consist of points that either focus on enhancing qi, invigorating yang, or activating the body's general energy and do not specifically target the yin deficiency suggested by the pulse characteristics. This makes the selected prescription the most suitable for the given condition.