Answer:
B). It prompts her to go warn Alec's wife about the poison.
Step-by-step explanation:
The conversation that takes place between Judson and his wife in advancing the plot by encouraging 'her to go and beware Alec's wife regarding the poison.' This implies that 'she was actually not present there to alert Alec about the poison in the whiskey when Judson falls.' This creates tension, interest, and suspense among the readers that what would happen whether Alec would be saved or not and will she be able to warn Alec's wife on time, etc. Thus, option B is the correct answer.