A Method is related to a generalized set of classroom specifications for accomplishing linguistic objectives. They tend to be concerned primarily with teacher and student roles and behaviors and secondarily with such features as linguistic and subject-matter objectives, sequencing and materials.
B Method is related to theoretically well-informed positions and beliefs about the nature of language, the nature of language learning, and the applicability of both to pedagogical settings.
C Method is related to pedagogical practices in general (including theoretical, underpinnings and related research). Whatever considerations are involved in “how to teach” are methods.
D Method is related to any of a wide variety of exercises, activities, or tasks used in the language classroom for realizing lesson objectives.