D: Contingent groups or pairs of projects describe where you can accept one but not all.
What are Contingent Groups or Pairs of Projects?
In terms of business, contingent groups or pairs of projects refer to those projects whose rejection and acceptance totally depend on the acceptance of the contingency or dependency on another project's rejection and acceptance.
Therefore, in conclusion, it is said that contingent pairs or groups of projects are such pairs of projects where it is permitted to select one project but not all.
You can learn more about contingent projects at
https://brainly.com/question/29815584
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