Final answer:
Option (d), Scythe Curie's season for living 'Falling Water' in Neal Shusterman's novel is Autumn, representing a period of reflection and maturity in her life as a scythe.
Step-by-step explanation:
The character Scythe Curie from Neal Shusterman's novel Scythe, which is a work of young adult speculative fiction, lives her season of 'Falling Water' during Autumn. This metaphorical season represents Curie's later stage of life, akin to the autumn of the year, which is often associated with maturity, reflection, and preparation for the end.
'Falling Water' signifies the time when a scythe must reflect on their gleanings and life choices, as they approach the end of their tenure. This period is imbued with the wisdom and experience accumulated over a lifetime of serving the mortal world in the utopian society where death has otherwise been conquered.