a. although the sun was shining, it wasn't that warm
b. we brought cassaroll to the faily with a new baby
c. do you actually believe in magic?
d. I searched for my parents faces in the crowd
"although the sun was shining, it wasn't that warm" is the correct answer because it contains a main clause (it wasn't that warm) and a prepositional phrase (although the sun was shining,). Hope this helps :)
