This quiz corresponds to what we learned in Class 2: about Yuan Source, Luo Connecting, Xi Cleft points; about combining points along a single channel.
Ying Spring points clear deficiency heat. Jing River points move qi and fluids, and in some cases, are believed to nourish yin through this movement. A combination that works here is Kid 2-Kid 7. Kid 2 Rangu is for Yin deficiency heat, particularly as it affects the lower jiao in women, with dryness and inflammation. Kid 7 Fuliu moves qi and fluids, and indirectly nourishes yin. Its name means "Return Flow", which could be interpreted as returning flow to yin. The combo "makes sense".
Explanation
The Shu Stream-He Sea combinations work best on the Yin channels, where the Shu Stream point is also the Yuan Source point. The lesser used Shu Stream points on the Yang channels (here, St 43) are not coincident with Yuan Source points, and typically are not commonly used.
Both Jing Wells and Xi Clefts can be viewed as releasing excessive pressure in a channel. They are the most viable option.
Shu Streams and Xi Clefts do not go well together, in the sense that one (Shu Streams) are building energy and flow in a channel, while the other (Xi Clefts) are releasing pressure in a channel. It is like filling a tub while the drain is out.
Ying Springs and Yuan Sources probably make the least sense, at least from a strict theoretical perspective. Ying Springs are for Yin Deficiency Heat, while Yuan Source points are best for Yang Deficiency Cold. It is highly unlikely that you will see both of these ON ONE CHANNEL.