National Highways are constructed and maintained by:

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answer is A.

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Detailed Solution

National Highways are constructed and maintained by the National Highway Authority of India (NHAI).
NHAI is an autonomous agency of the Government of India set up in 1995. It is responsible for maintaining, developing, and managing national highways and collecting tolls from several highways. NHAI operates under the Ministry of Road Transports and Highways and advises the central government on national highways.

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