Final answer:
The simple subject in the sentence is the dark evenings.
Step-by-step explanation:
The simple subject in the sentence is the dark evenings. The simple subject is the main noun/pronoun that the sentence is about, and in this case, it is referring to the dark evenings. The other options, 'dark,' 'evenings,' and 'time,' are not the main focus of the sentence and do not function as the subject.