To Test Whether an Upgrade to the Physical Environment of a Medical

To test whether an upgrade to the physical environment of a medical clinic would impact patient perceptions of medical staff, researchers surveyed patients immediately before and six months after a medical practice moved from a small office with outdated furnishings to a large, newly remodeled office.  Patient perceptions of medical staff were significantly improved at the new location.  Given this study design, which statement is supported?

A) The behavior of medical staff was a potentially confounding variable.
B) The timing of the data collection presented a threat to reliability.
C) Researchers could conclude that the upgraded environment created a halo effect for the medical staff.
D) Researchers could determine that the new environment was directly responsible for the improvement in patient perceptions of staff.

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