Select the most appropriate set of words from the given choices to fill in the blanks.

Nature is ______ and unchangeable , and it is ______ as to whether its hidden reasons and ______ are ______ to man or not.
The option that best fill the blanks in the above sentence would be:

A. relentless, indifferent, actions, understandable

B. persistent, heartless, actions, comprehensible

C. inexorable, apathetic, activities, explicable

D. ineseapable, unconcerned, activities, intelligible

Please do not use chat terms. Example: avoid using "grt" instead of "great".