What is actually being compared in βIt's like moist black velvet' from the selection is: D) the dark, humid night and moist, black velvet.
Comparison is known to be a way of showing or stating the similarities or dissimilarities between two things or people. When things are compared, one tries to find out how those things are similar to each other.
βIt's like moist black velvet" is actually used to compare the dark, humid night and moist, black velvet.
The use of "like" makes it a simile.
Learn more about simile on https://brainly.com/question/1706192