The prosecution ______ that the man had been responsible for an act of terrorism.

A．all high-school students take the same courses.
B．every high-school student must take some practical ability training courses.
C．every public school offers the same academic subjects.
D．the subject every student takes may vary.

A．enrichment of knowledge
B．accumulation of facts
C．acquisition of the ability to be creative
D．acquisition of the ability to work with his hands