The airline company, following through on recent warnings that it might start reducing service, announced that it was eliminating jet service to nine cities, closing some unneeded operations, and it grounded twenty-two planes.

(A) closing some unneeded operations, and it grounded
(B) closing some unneeded operations, and grounding
(C) was closing some unneeded operations, while it grounded
(D) it closed some unneeded operations and grounded
(E) it was closing some unneeded operations, and grounding

OA B

Source: GMAT Prep