The answer should definitely be C. The main concern people have with C is the processes by which it is produced and understood. In fact, the meaning of by has nothing to do with "produced and understood by processes", because it only means "by means of" If anyone google a little bit, he/she will find a lot of examples using "by which something is produced" The problem with A is that the processes cannot produce and make the language understood, it is through the processes people made it understood.
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