The correct answer for the question that is being presented above is this one: "b. Mary had heard herself mentioned to Miss Bingley as the most accomplished girl in the neighbourhood; and Catherine and Lydia had been fortunate enough never to be without partners, which was all that they had yet learnt to care for at a ball"
Answer:
compound-complex
Explanation:
"After we left practice" is a dependent clause that isn't a full sentence on its own, and "I went swimming" and "Mark ran around the track" are two independent clauses linked by a conjunction