Sentence fragments are sentences that lack the main verb or the subject. The sentence fragments cannot be completed by adding words and, but, or as they are joining words. Therefore, option B is correct.
Conjunctions are the joining words that link the phrases and the words in the given sentences and make them more flowy and complex. And, or, yet, but, for, so, etc. are some coordinating conjunctions. They do not complete the sentences.
The conversion of the subordinate clause, adding the missing subjects and missing verb, and making the incomplete sentence into a complete sentence.
Therefore, option B. adding conjunctions is not a technique that makes complete sentences.
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