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Option 2 : 2

Here the correct answer is 2.
:-
  • In the above given sentence, the error is in part 2.
  • It is so because in place of 'blocking', there should be a noun which is described by building.
  • 'Blocking' is a verb which has been wrongly used in place of blocks.
  • Therefore, 'blocking' will be replaced by 'blocks'.
Thus, the correct sentence is Proteins are providers of energy in an emergency, and are primarily used as building blocks for growth and repair of many body tissues.
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