Final answer:
In the sentence, 'remains' functions as a verb, describing the state of water vapor staying in cloud form in the atmosphere before falling as precipitation.
Step-by-step explanation:
In the sentence provided, the word 'remains' is used as a verb. It indicates the action or state of the water vapor staying in the atmosphere in the form of clouds before falling back to Earth as precipitation. Hence, the correct part of speech for 'remains' as used in the sentence is B. verb.
In the given sentence, "remains" functions as a verb. As the action word in the statement, it signifies the enduring state of water in the sky before precipitation. Verbs convey actions or states of being, and here, "remains" describes the continuous existence of evaporated water as clouds.
Understanding the part of speech helps to grasp the sentence's structure and meaning, highlighting the dynamic process of water cycling through evaporation, cloud formation, and precipitation. Recognizing the role of "remains" as a verb contributes to a comprehensive interpretation of the sentence's narrative about the atmospheric journey of water.