The term "divergent" is best described as _________.

Correct Answer: Option C — moving away from each other, as the inner walls of a tube that flare outward

Divergent geometry refers to a passage where the cross-sectional area increases in the direction of flow. In gas turbine diffusers, this expansion slows the high-velocity airflow, effectively converting kinetic energy into static pressure, which is essential for efficient combustion and overall engine thermal efficiency.