Answer:
B C
It certainly was cold, he concluded, as he rubbed his numb nose and cheek-bones with his mittened hand. He was a warm-whiskered man, but the hair on his face did not protect the high cheek-bones and the eager nose that thrust itself aggressively into the frosty air. At the man's heels trotted a dog, a big native husky, the proper wolf-dog, gray-coated and without any visible or temperamental difference from its brother, the wild wolf.
(Jack London, “To Build A Fire”)
At a little after seven Judy Jones came down-stairs. She wore a blue silk afternoon dress, and he was disappointed at first that she had not put on something more elaborate. This feeling was accentuated when, after a brief greeting, she went to the door of a butler's pantry and pushing it open called: "You can serve dinner, Martha." He had rather expected that a butler would announce dinner, that there would be a cocktail.
(F. Scott Fitzgerald, "Winter Dreams")
Only if you said its bad to keep up appearances and you did it yourself it would be hypocritical.
There is no passive voice for They are my friends. There isn’t even an active voice for it.
The verb in your sentence is to be (are). It is a linking verb followed by a subject complement (my friends). Linking verb sentences are neither active nor passive.
In order to form a passive construction, the original sentence must contain a direct object that can be promoted to the subject position. We find these direct objects following transitive verbs.
Put another way—direct objects do not follow linking verbs, and no direct object means no passive sentence.