Rearrange the parts of the sentence in correct order.
We are told that its
P-Public Distribution System
Q-creating a functional
R-sole purpose is the noble goal of

Let's link the fragments logically:
The opening line ends with the possessive pronoun "its", which needs to modify a noun phrase. Looking at the options, part R begins with "sole purpose", which fits perfectly ("its sole purpose...").

Part R ends with the prepositional phrase "noble goal of". The preposition "of" must be followed by a gerund or noun phrase. Part Q begins with the gerund "creating", making the connection "noble goal of creating a functional..." perfect.

Part Q ends with the adjective "functional", which needs a noun phrase to modify. Part P provides "Public Distribution System".

Combining these gives the logical sequence RQP: "We are told that its sole purpose is the noble goal of creating a functional Public Distribution System."