When kadijah and cal read the same foldable, they realized how interesting folktales can be. is it

a. simple sentence
b. compound sentence
c. complex sentence
d. compound -complex sentence

This is a complex sentence it includes a subordinate clause (one that CANNOT stand by itself), and a dependent clause.  You can tell this because if I were to walk into a room and say, "When K and C read the same foldable", you would be waiting to hear the rest, wouldn't you?  A compound sentence has two independent clauses joined by a comma and a coordinating conjunction (but, and, for, nor, or, so, yet).  A simple sentence is just an independent clause.

everett ross tried the pasta but liked the soup more

c. with one finger is the answer