Endoscopy can be used for locating tumours.

The diagnosis of lung tumours with CT imaging methods is routinely used due to: A: a) the small difference in density between the lungs and the tumours B: b) the large contrast between low density, air-filled lung tissue and solid lung tumour masses C: c) the absence of other imaging modalities to diagnose tumours

All tumours from AOM treated mice were _____ to histological examination after routine processing and haematoxylin and eosin staining.