How did ethnic tensions lead to instability in nigeria?

The following are the ethnic strains prompt precariousness in Nigeria 
- the imperfect decisions of 2007, confirmation of voting extortion, fixed races, political viciousness, INEC controlled by the administration 
- the contention in the Niger delta in view of the utilization of oil incomes, local people confront genuine ecological corruption, renegades are every now and again grabbing remote oil laborers 
- Nigeria's assorted qualities, three primary ethnic gatherings make up around 66% of the populace and they don't cooperate, additionally there is a solid religious gap amongst Christians and Muslims 
- Crime and debasement, in government as well as for the most part Nigeria is related with wrongdoing i.e. the 419 trick, unfavorable impact on speculators

b

Explanation:

improved transportation, communication, and other advantages.