___ in the form of unclear job expectations and other task uncertainties increase the likelihood for people to work at cross-purposes.

A) Task interdependencies
B) Role ambiguities
C) Competing objectives
D) Structural differentiations
E) Resource scarcities

Role ambiguities refer to unclear job expectations and other task uncertainties, which can cause confusion and may result in people working at cross-purposes. Task interdependencies and competing objectives may also contribute to this issue, but they are not specifically related to unclear job expectations and uncertainties. Structural differentiations and resource scarcities may have an impact on organizational performance, but they are not directly related to task conflicts caused by role ambiguities.