Question

The phenomena of public education is another example of the workings of democracy

(b) The phenomena of public education is yet another example of democracy at work.

(c) The phenomenon of public education is another example of how the workings of democracy work

(d) The phenomenon of public education is another example of democracy at work

(e) Public education, a phenomena, is another working example of democracy.

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Answer 1

The key here is that phenomena is the plural of phenomenon. (It's deceptive, because it comes from Greek, & so there's no -s at the end.)

So A & B violate subject-verb agreement, while E's a phenomena is no good--it's like saying a dogs.

We're left with C & D, and C's pretty hopeless as it contains workings of democracy. D's the answer.