What Is the Major Characteristic of a Stratified Sample

What is the major characteristic of a stratified sample?

A) The sample population is divided into subsets that are homogeneous for a particular trait or feature.
B) The sample population is divided into subsets for random assignment into an intervention group or a usual care group.
C) The sample population is randomly assigned to a specific subgroup that will differ from other groups on the basis of treatment type.
D) The sample population is randomly assigned to a specific subgroup that will differ from other groups on the basis of treatment duration.

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