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Option 1 : RPQ
It is clear that the last in sequence is Q since a sentence can't end with is (R) or Provides (P). Rule out 3) and 4). Backbone of what? This needs to be defined. This can be attained only with R being the first in sequence. Option 1) RPQ is the correct answer.
The backbone of the rural economy is agriculture; which also provides sustenance to over half of the country's population.
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