ranjeet75 wrote:To attract more tourists, the canton of Zurich commissioned several life-size fiberglass cow statues with chiming bells, having them decorated in a uniform pattern by local artists, and set them up on the streets of the greater Zurich metropolitan area.

A. the canton of Zurich commissioned several life-size fiberglass cow statues with chiming bells, having them decorated in a uniform pattern by local artists, and -- having them - change is tense.eliminate.

B. the canton of Zurich commissioned several life-size fiberglass cow statues with chiming bells, they were decorated in a uniform pattern by local artists, and then -- usage of they ..then awkward.eliminate.

C. the canton of Zurich commissioned several life-size fiberglass cow statues with chiming bells, had them decorated in a uniform pattern by local artists, and -- decoration was before setting up the statues. correct.

D. several life-size fiberglass cow statues with chiming bells were commissioned by the canton of Zurich, decorated in a uniform pattern by local artists, and then -- modifier error. several .. eliminate.
E. several life-size fiberglass cow statues with chiming bells, commissioned by the canton of Zurich, were decorated in a uniform pattern by local artists, and they -- modifier error. several ... eliminate.

OA is C. [spoiler]Whether the use of "had" is right?[/spoiler]