A prepositional phrase, as the name itself suggests, has to do with prepositions. So it is a phrase which starts with a preposition, and includes one, or more words after it.
In this case, the prepositional phrase is of dried meat, vegetables, and flour. The phrase acts as an adjective - what kind of supplies? (Those) of dried meat...
It means to mean something you mean
The answer is b.life is nothing but an empty dream
