A) As the former - Correctly used subordinate clause to qualify John, but fail on logical front. Nobody can attend meetings and do reviews as a FORMER chair.
B) The former - "The former chair" is subject and must followed by some verb to complete the sentence. It’s a case of sentence fragments.
C) Former – Has two problems. 1. Former should be preceded by some article. 2. After adding an article, this sentence will become similar to B.
D) She was – This is a case of comma splice.
E) As the – correct sentence. “As the” makes sentence before comma a subordinate clause, which qualifies John.
Each soul is potentially divine. The goal is to manifest this divine within.
--By Swami Vivekananda