Which option corresponds best to the missing figure? Explain why.
The answer is:
in chemistry, this would represent WATER in CPK colouring - two white hydrogen atoms and a red oxygen atom.
...which makes sense since the other 3 images are:
dot-to-dots for the traditional classical elemental symbols for air, fire and earth, and the missing element here is water (which is usually represented as a downwards-pointing triangle, also alluded to in the arrangement of the three circles here).
As for the title:
'A FEW' here stands for 'Air, Fire, Earth, and Water' and we are drawing figures depicting them (moreover, in this particular order).