What is the main focus of Elliott et al.'s integrated theory (Theory C) in explaining delinquency? a. The multiple paths to delinquency based on both motivation (strain) and control (bonds). b. The integration of multiple strain sources, including blocked goals and limited opportunities, leading to deviance. c. The idea that goals extend across social classes and involve more than just economic success. d. The incorporation of internal/external control distinction as a factor influencing deviance