Answer:
because the importent things are importent and when you do them you solve the problem and it,s good
A prepositional phrase consists of the preposition and its complement. From the given sentences above, the sentence in which the prepositional phrase best modifies the verb saw is option C. Through the window, I saw the bird flying. The prepositional phrase in this sentence is "through the window".
I think there are many best selling ones. Maybe you can Google it.