Bharat Electronics Ltd. makes important contributions in the field of _______________
A. Communication
B. Radar
C. Aviation
D. All of the above.

Hint: Bharat Electronics Ltd. was established to meet the defence needs of the Government of India. It manufactures state of the art electronic equipment for the use of Indian Defence Services.

Complete answer: Bharat Electronics is engaged in the development of defence as well as non defence equipment. It does design, manufacturing as well as supply of electronic systems.
Weapon systems, radar and fire control systems, and communication are the company’s principal services or products. Defence communication, radar, naval systems, intelligence systems, etc are all part of the company’s defence products. Civilian radars, homeland security, turnkey system solutions are part of the company’s non defence products. Apart from this it also makes electronic voting machines, radar warning received, casings, etc.

Therefore the correct answer is option D.

Note: Bharat Electronics Limited was also behind the manufacturing of Akash, the Indian-made air defence weapon system and another contribution of BEL is weapon locating radar, the state of the art radar which has undergone successful user trials by the Indian defence forces.