Final answer:
Macbeth's footsteps must be stealthy as he moves through the castle to avoid awakening anyone. This is crucial to the secrecy needed for committing regicide without being detected.
Step-by-step explanation:
The question you've posed is based on your reading of Macbeth, particularly, Act II and relates to how Macbeth moves through the castle. In the context of Macbeth creeping through the castle without awakening anyone, his footsteps must be stealthy. This term means to move in a cautious and surreptitious manner, so as not to be seen or heard, which is exactly what Macbeth would need to do while committing regicide. Other options like 'resounding' or 'conspicuous' would imply loudness and visibility, which would be counterproductive in his situation. 'Deliberate' might imply a thoughtful and purposeful manner, yet without the implicit need for quietness that 'stealthy' provides.