Which of the Following Best Describes the "Systems Reply" to Searle's

Which of the following best describes the "systems reply" to Searle's thought experiment?

A) We only attribute understanding to people because of their behavior, so we should for machines too
B) While the individual in the room doesn't understand the story, the system she's a part of does
C) There would be understanding if we put the system into a mechanism that walked around, perceiving
D) None of the above