Answer:
a) They are excited about Bingley's arrival because they have daughters of marrying age.
Explanation:
Mrs. Bennet sees Mr. Bingley as a possible suitor for her daughters and invites him to visit. The Bennets have five daughters. Mr. Bennet tends to favor Elizabeth, the second oldest, for her brilliance, while Mrs. Bennet prefers Jane, the eldest, for her beauty, and Lydia, the middle child, for her wit.