What line from "the golden cat" has a simile? his face is one big golden smile, it measures round, at least a mile— his claws peep through like rays of light, the never tired smiling one that human people call the sun. he makes the fields and meadows pur

The most obvious one is

His claws peep through like Rays of Light

It is kind of an odd comparison, but it is a comparison. His claws come out like rays of light means that the claws are barely noticeable as he unsheathes them. They are however like the first light of dawn or the last light of dusk.  He's sort of checking them to make sure they are there.

Don't know the context to your question, but that may because there is none. 
I would go with a). unique; diverse 

We are looking for a choice that will apply to ALL audiences. With that defense
b). probably would not work because not all audiences are attentive, but you hope that they will be. 
c). Doesn't sound right...individuals are for single people, and the way the question is phrased makes the audience a whole. 
Could Say: All audience members are individuals
d). groups; subgroups may work, but an audience is usually categorized as a whole group.