In which one of the following North-Eastern states was election to the State…

The Election Commission of India sometimes schedules a State Legislative Assembly election together with the Lok Sabha general election, whenever that assembly's five-year term happens to expire around the same period — combining the two polls into one exercise saves cost, security deployment, and administrative effort.

The 16th Lok Sabha general election was held in April–May 2014. Along with it, the Election Commission also conducted State Legislative Assembly elections in four states whose assembly terms were also expiring around that time: Andhra Pradesh, Odisha, Sikkim, and Arunachal Pradesh.

• Sikkim: its Legislative Assembly election in 2014 fell in the same April–May window as the 16th Lok Sabha polls.

• Meghalaya: its Legislative Assembly elections were held in 2013 and 2018, a separate five-year cycle from 2014.

• Manipur: its Legislative Assembly elections were held in 2012 and 2017, a separate five-year cycle from 2014.

• Mizoram: its Legislative Assembly elections were held in 2013 and 2018, a separate five-year cycle from 2014.

Cross-checking against the Election Commission's list of the four states that went to the polls simultaneously with the 16th Lok Sabha election (Andhra Pradesh, Odisha, Sikkim, Arunachal Pradesh) confirms that, among the North-Eastern states listed in the options, Sikkim is the one whose Assembly election coincided with the 2014 Lok Sabha polls.