Answer: C) The speaker's kiss is "the first suggestion that love
outlives the heavenly bodies.
Explanation:
Option A is incorrect because, if the speaker's whisper was meant to remind the girl that even love must end, the poem wouldn´t be a good example of "the endurance of love." Option B is incorrect because at no point does the daughter claim that God is "more
immortal even than the stars." Option D is incorrect because the speaker never implies that the daughter should mourn for all things that die, and not just herself.
In "On the Beach at Night," Whitman describes a father and his daughter watching the stars in the evening sky. When the sight moves the daughter to tears, the father kindly comforts her and states that there´s something that will last longer than Jupiter, the sun, or any star. Despite not offering an answer, we can infer that the author is referring to the love father and daughter share, and that´s why the poem shares the theme of "the endurance of love."