单选题：Which of the following statements is incorrect?

Which of the following statements is incorrect? @[C](1)
A. Virtual machines provide a robust level of security.
B. Virtual machines provide means for solving system compatibility problems.
C. Virtual machines run user programs more efficiently.
D. Virtual machines provide means for OS research and development.



A.Virtual machines provide a robust level of security.
B.Virtual machines provide means for solving system compatibility problems.
C.Virtual machines run user programs more efficiently.
D.Virtual machines provide means for OS research and development.


答案：C