The group or pairs of project that describe where you can accept one but not all is option D. Contingent
In philosophy and logic, contingency is the being of propositions that are neither true under every possible valuation nor false under every possible valuation. A contingent proposition is neither necessarily true nor necessarily false.
Therefore, contingent pairs of project implies that such pairs of project can incorporate one but not all. By extension, this kind of pairs (contingent) is the one that describes groups or pairs of projects where one can accept one but not all
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