An idea that is not actually stated in the text, but is kind of referred to, would be an alliteration I believe.
The answer is A, The radio adaptation's tone is more urgent than the novel's tone.
Some themes you might consider in the play include:
Greed
Power and ambition
What it means to be masculine and feminine
Trying to persuade
Idealism
What it means to be a (good/bad) leader
The importance of omens
The difference between villains and heroes