1) D. Platelets are the blood cells which aid in blood clotting. 2) C. Intestinal epithelial cells lines the intestine and helps in absorption of nutrients. ( Simple columnar epithelium) Solution 1) D. Platelets are the blood cells which aid in blood clotting. 2) C. Intestinal epithelial cells lines the intestine and helps in absorption of nutrients. ( Simple columnar epithelium).