Concept:The formation of ECOWAS began as a joint initiative between Nigeria and one other West African country in the early 1970s.
Explanation:Togo was the country that pioneered the idea of ECOWAS alongside Nigeria.
In 1972, Nigeria's Head of State, General Yakubu Gowon, and Togo's President, Gnassingbe Eyadema, held several meetings about creating an economic union for West African states.
They worked together to convince other West African leaders to accept the idea.
Their efforts succeeded when 15 West African heads of state and government met in Lagos on 28th May 1975.
At that meeting, the ECOWAS Treaty was signed, establishing the organisation.
Answer:B. Togo