To accurately answer your question, I would need to see the specific underlined sentence from H. H. Munro’s “The Open Window.” However, based on the options provided, it seems that the underlined sentence likely relates to one of the following aspects of Framton's character: his familiarity with surroundings, self-consciousness about shyness, lack of courage in new situations, or susceptibility to irritation.
If, for instance, the sentence suggests that he is feeling anxious or uncomfortable in a new place, then the most suitable answer would be that it suggests Framton lacks courage in new situations. Conversely, if it indicates that he feels awkward or nervous around others, then it could imply he is self-conscious about his shyness.
Please provide the underlined sentence for a more accurate interpretation.