Final answer:
Banquo is thinking about Macbeth's rise to power, the witches' prophecy, and the well-being of his descendants, but not his loyalty to Macbeth.
Step-by-step explanation:
In the opening soliloquy of Act III, Banquo is thinking of all of the following things except:
- His loyalty to Macbeth
- The witches' prophecy
- Macbeth's rise to power
- The well-being of his descendants
Throughout the soliloquy, Banquo expresses his suspicions about Macbeth and his ambitions, and contemplates the witches' prophecy that his descendants will be king. However, he does not mention his loyalty to Macbeth. Instead, he questions the motives of the witches and Macbeth's actions.