Will is putting items into categories to help remember the items.He is using

A) rehearsal.
B) organization.
C) seriation.
D) elaboration.

Elaboration

The addition of details to a basic structure or concept, enhancing understanding or providing a more complex explanation.

Seriation

The ability to arrange objects in order by size, location, or another attribute, which is a critical skill in cognitive development.

Organization

An organization is a structured group of people who work together to achieve common goals, following a systematic approach and guidelines, found in various forms such as businesses, nonprofits, and governmental bodies.