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Logical Reasoning: Statements: Which of the following conclusions is/are correct?

Logical Reasoning Q: Statements:   1. Some doctors are teachers.   2. All teachers are engineers.   3. All engineers are scientists.      Conclusions:   I. Some scientists are doctors.   II. All engineers are doctors.   III. Some engineers are doctors. Which of the following conclusion/s is/are correct? A. I only B. II only C. III only D. I and II only E. I and III only