Correct Option: B
Explanation: Paper invented/discovered by M. Dascd Jibrc in the year A.D 105 [Country: China]

Correct Option: D
Explanation: X-ray invented/discovered by Wilhelm K. Roentgen in the year 1895 [Country: Germany]

Correct Option: C
Explanation: Chronometer invented/discovered by John Harrison in the year 1735 [Country: Britain]

Correct Option: A
Explanation: Air-brake invented/discovered by Westinghouse in the year 1868 [Country: U.S.A.]

Correct Option: D
Explanation: Cyclotron invented/discovered by Ernest O. Lawrence in the year 1931 [Country: U.S.A.]

Correct Option: C
Explanation: Telephone invented/discovered by Antonio Meucci in the year 1849 [Country: Italy]

Correct Option: A
Explanation: <p><strong>Johanne Gutenberg</strong> Invented <em>Printing Press</em>.<br /><strong>Johannes</strong> Gensfleisch zur Laden zum Gutenberg was a German goldsmith, inventor, printer, and publisher who introduced printing to Europe with his mechanical movable-type printing press.<br /><strong>Born</strong>: Mainz, Germany<br /><strong>Died</strong>: 3 February 1468, Mainz, Germany<br /><strong>Nationality</strong>: German<br /><strong>Full name</strong>: Johannes Gensfleisch zur Laden zum Gutenberg<br /><strong>Books</strong>: Vocabularius ex quo<br /><strong>Parents</strong>: Friele Gensfleisch zur Laden, Else Wyrich</p>

Correct Option: C
Explanation: Telegraph code invented/discovered by Samuel F. B. Morse in the year 1837 [Country: U.S.A.]

Correct Option: A
Explanation: Stethoscope invented/discovered by Rene Laennec in the year 1819 [Country: France]

Correct Option: B
Explanation: Radar invented/discovered by A.H. Taylor & Leo C. Young in the year 1922 [Country: U.S.A.]