Answer:
A. The knowledge that only the audience has creates suspense.
Explanation:
In the stage direction, we, the audience are told or shown there's a huge hole in the middle of the stage. This is not known by the two characters Carlos and Dante.
So, after Dante bids "Adios!" to Carlos and moves towards the hole, there is suspense in that there is a hole in the direction of his way. And we, the readers, have a feeling that danger is there which Carlos nor Dante knows about. The knowledge that only the readers know creates suspense in the play.
Thus, the correct answer is option A.