20.

Answer and Explanation

Your Answer is

Correct Answer is H

Explanation

H item proof is an apposition of station brand. Burn a station brand into our walking sticks refers to "printing the name of the station on our walking sticks as a sign of our progress".

F item: which guides the attributive clause to act as the subject or object in the clause, F item does not lack the subject or object, wrong.

Item G: Commas cannot be used between two complete sentences.

Item J: The error is a complete sentence before the sticks, and a verb proved cannot be added.