What does it mean to be as soft as silk?

Avery soft (The cover of my new book is as soft as velvet)
Bvery black (The pirate's evil eyes are as black as coal)
Cvery soft or gentle (The singer's sweet voice sounded as soft as silk)
Dvery smooth (He washed his face until it was as smooth as glass).

Verified Answer :

AVery soft. Silk is soft. It's not necessarily black, doesn't sound like anything, and doesn't have to be very smooth.
Tazzie

Must be soft it doesn't have to be smooth