Language is arbitrary because it is based on social agreement. There is no reason or explanation to why things are named the way they are.
Language is a system of sounds and signs that must be organized according to some patterns in order to achieve communication. Therefore is systematic.
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Answer:
I believe it's A.
Explanation:
C doesn't make any sense. The sentence is clear in reading.
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Adjective Large
Noun fish, sea
Adverb swiftly
Verb swim