D.

hydrogen ions are actively secreted into the filtrate

The proximal tubule is the portion of nephron of the kidney which leads from the Bowman's capsule to the loop of Henle. It regulates the pH of the filtrate by exchanging hydrogen ions in the filtrate. Due to the H⁺ ions the human urine is usually acidic. Thus H⁺ are actively secreted into the filtrate is the correct option. 

C.

Tubular parts of nephrons - Cuboidal epithelium

Cuboidal epithelium is present in th tubular parts of nephron (PCT and DCT). It consists of short, cube -shaped cells with round nuclei located in the centre of the cell. These cells forms microvilli to increase the absorptive surface area of the cell.
Other correctly matched points are
Inner lining of salvasry ducts is lined by compound epithelium. Moist surface of bucaal cavity is lined by compound epithelium. Inner surface of bronchioles is lined by ciliated epithelium.