Which sentence(s) of the following paragraph should be referenced? (The paragraph is broken into individual sentences for ease of identification.) (1) Country Z has a federal system that makes up of six States. (2) In the past three years, two States have outgrown the others four states by about two percentage points. (3) However, economists predict that given the economic and social characteristics of all six States are very similar, the growth gap will eventually narrow or even completely disappear. (4) How long it will take for the gap to close is an open question though