Select the most appropriate meaning of the given idiom.
Walk a tightrope

The correct answer is To act carefully in a difficult situation.

Explanation:

The idiom "Walk a tightrope" refers to a situation where someone must act with great care, precision, or caution because a single mistake could lead to severe consequences or failure, much like a circus performer walking on a high wire.

Meaning of the given options:

1. To walk on a narrow road - Literal interpretation, which is incorrect for an idiom.
2. To try and balance yourself - Another physical/literal interpretation rather than the figurative meaning.
3. To be tensed about something - While the situation may cause tension, it does not capture the full meaning of behaving cautiously.
4. To act carefully in a difficult situation - Correct. Captures the precise figurative meaning of taking extreme care when dealing with a risky or complex situation.