10. Calorimeters are used to measure bond energy by providing
A. an open system, where matter and heat can be exchanged with the surroundings.
B. A closed system, where heat can be exchanged with the surroundings, but not matter.
C. An isolated system, where neither heat nor matter can be exchanged with the surroundings.
D. A combined system, where heat and matter can periodically be exchanged with the surroundings.