The right answer is: Cause. Causes are understood as the foundations or the beginning of a certain situation. The cause is the first instance from which events or specific situations are developed that are a necessary consequence of that and that therefore can be completely different to those that result from the presence of other causes or of the same but in a different context.
A cause can also be understood as a doctrine on which an ideology is taken and which it is sought to develop, encourage or protect (for example, the cause of care of the environment). Finally, the term "cause" is in turn used in the judicial field to refer to the processes that are initiated before certain crimes or felonies.