Answer:
C. In a concluding manner
Explanation:
Conclusive is an adjective. It´s portraying an adjective in the sentence, not a verb even though concluding is a verb. Hope this helps. Always pay attention to the part of speech.
On the knowledge of word forms or patterns, the meaning of the word conclusive is in a concluding manner Option(c) is correct.
Conclusive means putting an end to debate generally for the reason of irrefutability generally when you here that you have a conclusive result which means that is important to draw a conclusion.
So relatively based on the sentence or the Knowledge of the word the word conclusive is regardless in a concluding manner.
Therefore Option(c) is correct.
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