【单选题】

Which of the following statements concerning nanotechnology research is most directly suggested in the passage

A、Nanotechnology research tends to be more focused on the process of building multiple molecules than chemistry research.
B、Nanotechnology research is increasingly less bound to operations on the microscopic level than it once was.
C、The practitioners of nanotechnology tend to be more optimistic than pragmatic in choosing its methodology.
D、Nanotechnology research involves a much greater level of technical knowledge, on the whole, than chemistry research.
E、Nanotechnology research tends to be more concerned at this stage with precision than convenient mass production.