Concept:Middlemen act as links between producers and consumers.
A threat to them occurs when consumers buy directly from producers, bypassing these links.
Explanation:A consumers cooperative society is an association of consumers who join together voluntarily.
It buys goods in bulk directly from the producers and gets discounts.
Then it sells the goods in small quantities to its members.
This removes the need for wholesalers and retailers, who are the middlemen.
So, the consumers cooperative society directly threatens the existence of middlemen.
The other options do not eliminate the middlemen in this way.
Answer:A. consumers cooperative society