Fill in the blank with the correct option. Sentence: All primitive societies…

Answer: All primitive societies need organised forms of trade.

• Key idea: the sentence requires a phrase that describes the structured kinds of trade systems.

• Why this fits: "Organised" is an adjective modifying "forms," so "organised forms of trade" clearly means structured ways of exchanging goods.

• Why the other choices are less suitable: The noun "organisation" alone is awkward without "of trade," the phrase with a spelling mistake is incorrect, and "need forms" is too vague.

• Note on spelling: "Organised" is British spelling; the American variant is "organized." Both are acceptable.