Verified Answer :

Well, in general, world-wide I would say that the best answer is D.  - political parties unite people who have the same views and would like to promote these views exercising political powers.

On a local scale, the parties need to follow laws (and in some countries, the law might only allow one party) and they might even only exist to support a certain candidate (but usually it's the other way: the candidate represents the party).

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