Final answer:
NOA is not an agent of metamorphic change; rather, temperature, pressure, and chemically reactive fluids are the agents that transform rocks during metamorphism. Option e is correct.
Step-by-step explanation:
Among the options provided, the one that is not an agent of metamorphic change is (e) NOA. During the metamorphic process, temperature, pressure, and chemically reactive fluids are all influential agents that can lead to the recrystallization and transformation of rocks.
Temperature and pressure play crucial roles, as they facilitate the migration of ions and the re-orientation of minerals within the rock structure. Additionally, rock composition and volatile substances (such as water and carbon dioxide) can influence the metamorphic process by altering the chemical reactions and conditions under which the rock forms. However, NOA, which stands for naturally occurring asbestos, is not considered an agent of metamorphism. Instead, it is a mineral that may form within certain metamorphic rocks.