28.
Your Answer is
Correct Answer is G
Explanation
The subject of the sentence is the collection, the part before the subject is a modifier, and its logical subject should be consistent with the subject of the main clause.
G item: the logical subject of an impressive contribution is the collection.
Item F: The logical subject of declared a national hero (known as a national hero) is not the collection, wrong.
Item H: The logical subject of his minimal expertise is not the collection, wrong.
Item J: The logical subject of better known as an explorer is not the collection, wrong.