Answer:
Witches contribute to a dark, mysterious and suspenseful mood.
Step-by-step explanation:
This question is about "Macbeth".
Witches are figures associated with evil, fear and terror. For this reason, their presence in a literary work has the ability to create dark moods, where fear is present and there is a sense of mystery and suspense, where it is expected that something evil is revealed. This is no different in "Macbeth" where the presence of witches in the second act of the play has the ability to transmit this type of mood to the reader and viewer.