I'm so confused about this question.

Jesse Jackson's Rainbow PUSH _______ to encourage diverse populations to become socially and politically active, was created in 1996 by the merging of 2 groups Jackson had previously founded

We're offered 5 options to fill in the blank:

  1. coalition was established
  2. coalition is established
  3. coalition, establishing
  4. coalition, which being established
  5. coalition, established

The official, correct answer is 5, but I just cannot understand why 1 is wrong?

closed as off-topic by Dan Bron, Julie Carter, choster, Chenmunka, sumelic Sep 24 '15 at 21:11

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1 is wrong because using it gives two finite predicates joined only by a comma. Bracket out the modifiers and here's what you end up with:

Jesse Jackson's Rainbow PUSH Coalition was established for this reason , was created in 1996 in this way.

5, however, subordinates the established clause, so you have only one finite predicate:

Jesse Jackson's Rainbow PUSH Coalition, established for this reason , was created in 1996 in this way.

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