Final answer:
The provided text excerpts illustrate various laughter-related scenarios but do not specifically mention a 'lady in the attic' describing a 'land of laughter,' making it impossible to determine which action, among giggling, bursting into laughter, feeling intrigued, or becoming confused, would be the correct response for the boys. option A is the correct answer.
Step-by-step explanation:
In the context of the provided text excerpts referencing laughter, it seems that the land of laughter mentioned does not directly correlate with any of the given passages. Instead, these excerpts illustrate various scenarios involving laughter or amusement, ranging from a woman sharing about Ladyland where ladies rule, a slapstick act that amuses an audience, an outburst of laughter from a startled individual, to soldiers singing with mixed emotions and a woman laughing after throwing braids onto a porch.
Considering these contexts, none of the excerpts specifically mention a lady in the attic telling a story about a land where people laugh, thus making it challenging to determine which action would follow such a scenario without additional information.
Therefore, without the correct text reference to the 'land of laughter' and the 'lady in the attic', it is not possible to confidently choose between the provided options A) Giggle uncontrollably, B) Burst into laughter, C) Feel intrigued, or D) Become confused.