The correct anwer is option B) "colonists, goods, knowledge, Native Americans".
The words colonists, goods and knowledge are common nouns, and Native Americans is a proper noun.
Option A) is incorrect since the word "often" is not a noun but an adverb.
Option C) is also incorrect since the word "English" in this sentence is used as an adjective, and the word "exchanged" is the verb of the sentence.
And finally, option D) is also incorrect since English is used as an adjective, often is ans adverb, and exchanged is a verb.
