Wich of the following sentences contains two ideas joined by a connecting worf

Answer is A.

"Sally lives with her parents, although she could afford her own apartment."

Although is used here to combine two ideas together.

Doulingo is good. you can also watch movies that are in french, i am using this tactic  for japanese  and it a lot. listing to music with  french  lyrics would work well too because  you could absorb  the words while having fun.hope this ! : )