The reply is:

C

As a result of:

in chemistry, this might signify WATER in CPK colouring – two white hydrogen atoms and a crimson oxygen atom.

…which is sensible because the different 3 pictures are:

dot-to-dots for the normal classical elemental symbols for air, hearth and earth, and the lacking factor right here is water (which is often represented as a downwards-pointing triangle, additionally alluded to within the association of the three circles right here).

As for the title:

‘A FEW’ right here stands for ‘Air, Hearth, Earth, and Water’ and we’re drawing figures depicting them (furthermore, on this specific order).