IMO D
Highly skeptical.

challenger63 wrote:In a recent poll, 56 percent of teachers and administrators favored an attendance policy as strong or stronger that the present policy.

A. an attendance policy as strong or stronger than

B. an attendance policy that is stronger, or at least so strong as,

C. an attendance policy as strong or stronger that is

D. at least as strong an attendance policy as is

E. an attendance policy at least as strong as

OA will be later.

Source: 800Score

In A, B and C, the required idiom is AS STRONG AS.
Eliminate A, B and C.

In the idiom as X as Y, X and Y should be parallel.
D and E employ ELLIPSIS: the omission of words whose presence is understood.

E implies the following comparison:
an attendance policy [that IS] at least as STRONG as the present policy [IS STRONG].
This comparison is concise and parallel and makes sense: how one policy IS STRONG is compared to how another policy IS STRONG.

D seems to imply the following comparison:
at least as STRONG AN ATTENDANCE POLICY as IS the present policy [A STRONG ATTENDANCE POLICY].
This comparison is awkward, lacks parallelism, and seems redundant.
Eliminate D.

The correct answer is E.

In the idiom as X as Y, the first noun in the comparison generally will PRECEDE the first as:
a MAN as tall as JOHN.

The OA here is modeled after the OA to an official SC:
[spoiler]In a recent poll, 86 percent of the public favored a Clean Air Act at least as strong as the present act.[/spoiler]

challenger63 wrote:In a recent poll, 56 percent of teachers and administrators favored an attendance policy as strong or stronger that the present policy.

A. an attendance policy as strong or stronger than

B. an attendance policy that is stronger, or at lease so strong as,

C. an attendance policy as strong or stronger that is

D. at least as strong an attendance policy as is

E. an attendance policy at least as strong as

OA will be later.

Source: 800Score

OA: E