Option B is correct because the textbook explicitly states that 'The electronics industry covers a wide range of products from transistor sets to television, telephones, cellular telecom, telephone exchange, radars, computers and many other equipments required by the telecommunication industry.' This clearly identifies telephones and computers as products of the electronics industry. Options A (Steel) and C (Aluminium Smelting) are incorrect as they are basic industries dealing with metals, not finished electronic goods. Option D (Information Technology) is incorrect because IT primarily deals with software and services, whereas the manufacturing of hardware like telephones and computers falls under the electronics industry.