Conflict at NewTel appears to have all of these sources EXCEPT:

A) task interdependence.
B) differentiation.
C) goal incompatibility.
D) scarce resources.
E) ambiguity.

Differentiation is evident in the differing backgrounds and focuses of the executives (engineering vs. marketing/service). Goal incompatibility is shown by the conflict between investing in technology versus marketing/customer services. Scarce resources are highlighted by the limited discretionary spending leading to budget conflicts. Task interdependence isn't directly mentioned as a source of conflict; the tension arises more from differing priorities and backgrounds than from how their tasks depend on each other.