If we don't offer a good price for the house now, we'll probably miss the boat.
To solve this phrase, consider the idiomatic expression "miss the boat," which means failing to take advantage of an opportunity due to acting too late. This analysis guides us to the options provided.
Options Analysis:
Acted quickly: Opposite of the idiomatic meaning, as it suggests prompt action.
Acted late: Aligns with "miss the boat," indicating a missed opportunity due to delayed action.
Unpleasant situation: Does not capture the essence of timing or opportunity missed.
Historical theme: Irrelevant to the context of timing in opportunity.
Based on the analysis, the correct answer is: Acted late.