Which of the following personalities is trained by a Serbian terrorist group known as the "Black Hand"?

The correct answer is Option(1).i.e.Gavrilo Princip.

• Gavrilo Princip is a Serbian militant, trained & armed by a Serbian terrorist group known as the ''Black Hand''. 
• Gavrilo Princip: 
  • He is a Serbian militant who assassinated Austrian Archduke Franz on June 28, 1914.
  • He was also trained & armed by a Serbian terrorist group known as the "Black Hand".
• The following table represents some important personalities of the first world war with respective characteristics. 

  Important Personalities in 1st World War	Characteristics
  Maximilian von Spee	He is a German admiral in the famous East Asia Squadron part. Spee is renowned for his victory in the Battle Of Coronel against the Christopher Cradock, British admiral on 1st Nov 1914
  Paul von Hindenburg	A German general credited with a huge victory at the Battle Of Tannenberg, over Russia in August 1914.
  Gavrilo Princip	A Serbian militant who assassinated Austrian Archduke Franz on June 28, 1914. He was trained & armed by a Serbian terrorist group known as the Black Hand.
  Prince Max von Baden	Chancellor of Germany during the final months of the World war I