Choose the well punctuated conjunctive adverb to complete the sentence. These obvious contamination problems have long been knownwhat is not often realised is the organic matter carried in ground water can contaminate samples. " a. ,however, " "b. :however," "c. ; however, " d. However

The correctly punctuated conjunctive adverb can be found in option c. ; however,

The sentence is then:

These obvious contamination problems have long been known; however, what is not often realised is the organic matter carried in ground water can contaminate samples.

Explanation:

"However" indicates a relationship of contrast between two independent clauses. When we wish to join those clauses to form a compound sentence, we must punctuate properly. The right way to do it is by placing a semicolon before and a comma after "however". This is why letter C is correct.

Another possibility would be using a full stop/period before "however" and a comma after it. In this case, we would not be forming a compound sentence, though. Letter D is incorrect because it is missing both the period and the comma. Letters A and B do not follow any of those possibilities.

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