Answer: A — Hindustan Computers Limited
Hindustan Computers Limited (HCL) is a private sector company, whereas Bharti Airtel, Hindustan Unilever, and Bharat Heavy Electricals are all publicly listed companies traded on stock exchanges.
(Note: If this question is from Political Science/Civics context, the odd one out is B — Bharti Airtel Limited, as HCL, HUL, and BHEL all have "Hindustan/Bharat" in their names suggesting public/national identity, while Bharti Airtel does not follow this naming pattern.)
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This question does not appear in the provided source passages, which are about political parties. The options are company names. The most likely expected answer is Bharti Airtel Limited — as Hindustan Computers Limited, Hindustan Unilever Limited, and Bharat Heavy Electricals Limited all contain "Hindustan" or "Bharat" in their names (indicating national/public sector association by name), while Bharti Airtel does not follow this pattern. Examiners typically look for pattern-based reasoning here. Since no passage supports this, use the naming-pattern logic.