Answer:
B. Stratification
Explanation:
The word stratification makes reference to the classification and/or division of a group of individuals or objects into different ranks.
The other words mean something different; for example, secularization has to do with the process of making something "secular", in other words, devoid of religion. Then, resolution is connected with decisions taken by an individual. Finally, application can be a written request for something or a practical way of doing something, for instance, "the application of this new method of studying is that students will improve their writing accuracy...."
