Concept:
The Positive School of Criminology emerged in the 19th century and focused on scientific and biological explanations of criminal behavior.
Step 1: Evaluate Statement A.
Free-will theory belongs to the Classical School of Criminology, not the Positive School.
Therefore, Statement A is incorrect.
Step 2: Evaluate Statement B.
The Positive School explained criminal behavior through biological and sociological factors rather than purely legal definitions.
Therefore, Statement B is correct.
Step 3: Evaluate Statement C.
Cesare Lombroso, Enrico Ferri, and Raffaele Garofalo are the main founders of the Positive School.
Therefore, Statement C is correct.
Step 4: Evaluate Statement D.
The Positive School focused more on the personality and condition of the offender rather than only the criminal act.
Therefore, Statement D is correct.
Step 5: Evaluate Statement E.
Deterrent and definite punishment are ideas associated with the Classical School, not the Positive School.
Therefore, Statement E is incorrect.
Step 6: Conclude the answer.
Statements B, C, and D are correct.
Hence, the correct option is:
\[
\boxed{\text{B, C \& D Only}}
\]