Final answer:
The phrase 'greeted' in the sentence means 'welcomed affectionately.'
Explanation:
In the sentence, 'A low boom greeted the Nautilus as its upper part showed above the water,' the phrase that best reflects the connotative meaning of 'greeted' is welcomed affectionately. This choice implies a warm and friendly reception, aligning with the positive context of the Nautilus being welcomed as it emerged.
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