Questions 14-16 are based on the following passage. You now have 15 seconds to read questions 14-16.

The examples of the Challenger and Chernobyl cited by the author serve to show that ______ .

A．if not given close examination, technology could be use to destroy our world
B．technology is a human creation, so we are responsible for it
C．technology usually goes wrong, if not controlled by man
D．being a human creation, technology is liable to error