A) A-Unicellular gland, B-Multicellular gland, C-Multilayered cells
B) A-Multicellular gland, B-Unicellular gland, C-Squamous epithelium
C) A-Goblet gland, B-Multicellular gland, C-Columnar epithelium
D) A-Flattened cell, B-Multilayered cells, C-Transitional epithelium