Which set contains the principal body-build types in Ernst Kretschmer’s…

Concept

A constitutional typology groups personality patterns by recurring physical-constitution or body-build categories. Each theorist’s labels must therefore be matched to that theorist’s own framework rather than to another personality system.

Application

Ernst Kretschmer’s scheme uses asthenic (also called leptosomic), athletic, and pyknic as its principal body-build types; it also discusses dysplastic or mixed forms.

Contrast

• Introvert, extrovert, and ambivert concern orientation, not Kretschmer’s body-build labels.

• Endomorph, mesomorph, and ectomorph belong to William Sheldon’s somatotype framework.

• Sanguine, choleric, and melancholic belong to the classical temperament tradition.

Cross-check

Matching each set to its originating framework leaves asthenic, athletic, and pyknic as the Kretschmer set.

Result

Therefore, the required set is asthenic, athletic, and pyknic.