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