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The correct answer is option 3: 1 and 4 only.
In June 2014, the Union Government granted Navaratna status to two companies: Engineers India Ltd. and National Buildings Construction Corporation Ltd.
1. Engineers India Ltd. is a public sector enterprise in the field of engineering and construction. It offers a range of services such as feasibility studies, design engineering, project management, construction supervision, and operation and maintenance of petroleum refineries, petrochemical plants, pipelines, offshore and onshore oil and gas terminals, and other infrastructure projects.
2. Coal India Ltd. and India Trade Promotion Organization are not included in the list of companies that received Navaratna status in June 2014.
3. National Buildings Construction Corporation Ltd. is a public sector company primarily engaged in the construction of civil and structural engineering projects.
Therefore, the correct answer is 1 and 4 only.