A government initiative aimed at providing reliable electricity to all households in Nagaland is:

Saubhagya Scheme
Ujwal DISCOM Assurance Yojana (UDAY)
Deen Dayal Upadhyaya Gram Jyoti Yojana (DDUGJY)
Pradhan Mantri Kisan Urja Suraksha evam Utthaan Mahabhiyan (PM-KUSUM)

The correct answer is: a) Saubhagya Scheme.

The Saubhagya Scheme is a government initiative aimed at providing reliable electricity to all households in India, including Nagaland. The scheme was launched in September 2017 and aims to provide electricity to all households by December 2018.

The Saubhagya Scheme is a centrally sponsored scheme and is being implemented by the Ministry of Power. The scheme is being funded by the central government and the state governments.

The Saubhagya Scheme is providing free electricity connections to all households that are not connected to the electricity grid. The scheme is also providing financial assistance to households that cannot afford to pay for the electricity connection.

The Saubhagya Scheme is a major initiative of the government to provide electricity to all households in India. The scheme is expected to benefit over 40 crore households in India.

The other options are not government initiatives aimed at providing reliable electricity to all households in Nagaland.

Option b) Ujwal DISCOM Assurance Yojana (UDAY) is a government initiative aimed at reforming the power distribution companies in India.

Option c) Deen Dayal Upadhyaya Gram Jyoti Yojana (DDUGJY) is a government initiative aimed at providing electricity to all villages in India.

Option d) Pradhan Mantri Kisan Urja Suraksha evam Utthaan Mahabhiyan (PM-KUSUM) is a government initiative aimed at promoting solar energy in the agriculture sector.