Which of the following best describes Robert Merton's key contributions to the field of sociology?

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Effectively integrating theoretical frameworks with empirical studiesDeveloping a perspective on deviance centered on societal objectives and available methodsStriving to unify analyses at both macro and micro sociological levelsAll of the above

Explanation

Robert Merton's sociological work includes successfully merging theory with research, offering a deviance theory focused on social goals and means, and attempting to connect macro-level and micro-level social analyses. Therefore, all these contributions are attributed to him.