which technical adjustment would \harden\ the x - ray beam?\nincreased kilovoltage peak (kvp)\ndecreased…

Brief Explanations:

Hardening the x - ray beam means increasing the average energy of the x - ray photons. Adding filtration removes low - energy photons from the x - ray beam, effectively increasing the average energy (hardening it). Increasing kVp changes the overall energy spectrum but adding filtration is the key factor for hardening. Decreasing kVp reduces the overall energy and removing filtration would allow more low - energy photons to pass through.

Answer:

C. Adding filtration