Concept:The All Progressives Congress (APC) was formed through the merger of major opposition parties ahead of the 2015 general elections.
Explanation:The APC came into existence on 6 February 2013.
It was created by the coming together of three major parties.
These parties are the All Nigeria Peoples Party (ANPP), the Action Congress of Nigeria (ACN), and the Congress for Progressive Change (CPC).
A faction of the All Progressives Grand Alliance (APGA) also joined the merger.
The United Progressive Grand Alliance (UPGA) did not take part in the formation of the APC.
UPGA was a separate historical political alliance from Nigeria’s First Republic era.
Therefore, among the listed options, UPGA was not a founding partner of the APC.
Answer:C. United Progressive Grand Alliance (UPGA)