Explanation
Of all the choices, the deadline of December 31 is the best example of a constraint.
Answer B is incorrect. This is an assumption and/or a loose requirement of the solution's work.
Answer A is incorrect. This is a loose constraint as there's the maximum amount of finance available, but as
long as the solution is less than this amount, it's acceptable.
Answer D is incorrect. This is an example of an assumption, as there's no evidence that external resources are
not needed.