An invitation to dinner was soon afterwards dispatched; and already had Mrs. Bennet planned the courses that were to do credit to her housekeeping, when an answer arrived which deferred it all. Mr. Bingley was obliged to be in town the following day, and, consequently, unable to accept the honor of their invitation, etc. Mrs. Bennet was quite disconcerted.
Which is the best definition for the word disconcerted as it is used in this sentence?
A) giddy and silly
B) disappointed and upset
C) joyous and celebratory
D) despairing and grief-filled