It's "computers", because they're the subject of the verb to be.
I think.
Answer:
“Macbeth” is a tragedy, so its tone is predominantly dark, elegiac and depressing. “Blood will have blood”, as Shakespeare wrote in Act III, Scene IV of the play, foreshadows the series of murders taking place, which, as a result, stir bleak and sinister feelings among the readers
Explanation:
True :) it means to say or pronounce clearly
