The character who secretly watches and listens is?

Read the extract and answer the question

At mine unworthiness, that dare not offer
What I desire to give; and much less take
What I shall die to want. But this is trifling;
And all the more it seeks to hide itself,
The bigger bulk it shows. Hence, bashful cunning!
And prompt me, plain and holy innocence!

(Act 111, scene one lines 78 – 83)

A. Trinculo
B. Stephano
C. Caliban
D. Prospero

Correct Answer:

Option D – Prospero