Between Scylla and Charybdis means between two equally dangerous or difficult choices. The correct answer is this meaning because the expression is used figuratively, not only by its literal words.

Examples:

• The negotiator was between Scylla and Charybdis.
• In an HSC essay, Between Scylla and Charybdis can express this meaning: between two equally dangerous or difficult choices.
• When this expression appears in a passage, connect Between Scylla and Charybdis with the idea of between two equally dangerous or difficult choices.