Final answer:
In chapter 23 of Pride and Prejudice, Jane's reaction to Mr. Collins and Charlotte's engagement is indifferent.
Step-by-step explanation:
In chapter 23 of Pride and Prejudice, Jane's reaction to Mr. Collins and Charlotte's engagement is described as indifferent. She does not express a strong reaction and seems to be unaffected by the news. Jane's lack of emotion can be seen in the excerpt where she suffers from uncomfortable feelings and occasionally from some peevish allusion of her mother.