Explanation/Reference:
Explanation:
Of all the choices, the belief about the project team members is the best example of an assumption. An assumption is something that is believed to be true, but it has not been proven to be true.
B is incorrect. This is an example of a constraint.
D is incorrect. This is an example of a requirement.
C is incorrect. This is an enterprise environmental factor, which could also be seen as a
requirement.