Which-of-the-following-types-of-beams-has-the-largest-LET-linear-energy-transfer-when-it-is-incident-on-human-tissuenn-A-6-MV-photon-beamn-B-100-keV-electron-beamn-C-5-MeV-alpha-particle-beamn-D-3-MeV-electron-beam

C. 5 MeV alpha-particle beam. Alpha particles have a high mass and charge, which results in a high LET when they interact with human tissue. This means that they deposit a large amount of energy in a very small area, potentially causing significant damage to cells and tissues. The other beams listed have lower LET values and are less damaging to human tissue.