Final answer:
Without the relevant text or dialogue in which Gerda's opinion about a future husband is stated, it is not possible to determine the most important quality she mentions, why others laugh at her opinion, or to agree with either perspective.
Step-by-step explanation:
The question refers to a dialogue from a theatrical play where Gerda discusses the qualities she values in a future husband. The character Gerda states that the most important quality for her in a future husband is not specified in the excerpts provided, so it is not possible to directly answer what she states as the most important quality.
Without the context of Gerda's actual statement, we cannot ascertain why the other girls laugh at her opinion or whether one would agree with her or the girls. To provide an accurate response, the specific text where Gerda discusses her views on marriage would be required.