Uses established rules to draw conclusions, whereas in such rules are not established, and we may not know the consequences of evaluating and choosing alternatives.
a) heuristics/algorithms.
b) reasoning/decision making.
c) heuristics/reasoning.
d) creativity/reasoning

Reasoning, Decision making

Step-by-step explanation:

The reasoning is the process of mental. In the process, reasoning needs a reason for establishing the facts. This is a cognitive process. All people engage in reasoning due to their ability to introspection. The reasoning is different in every field in every aspect.  

The cognitive process plays a role in both reasoning and decision making. These both are the sub-field creative thinking. Many factors create a barrier in decision making such as incomplete information, emotional and physical resources.  

Thus when we may not know the consequences we used both reasoning and decision making.