Explanation:

- Lacuna: This refers to a gap, missing part, or something absent. It's often used to describe missing information or an unfilled space in a piece of writing or an argument.

- Apathy: This means a lack of interest, enthusiasm, or concern. It's used to describe an emotional state where someone is indifferent or unresponsive.

- Hiatus: This describes a pause or break in continuity. It is very similar to "lacuna" as both imply a gap or absence.

- Misfortune: This refers to bad luck or an unfavorable circumstance. It does not relate to a gap or absence.

- Languor: Means a state of fatigue or weakness. It's more about a feeling of tiredness and does not imply a gap or absence.

Correct Answer:

- Option: 2, Hiatus: It closely matches the idea of a gap or break.