In the questions given below, there are two statements marked as Assertion (A) and Reason (R). Read the statements and choose the correct option.

1. Both Assertion (A) and Reason (R) are correct and Reason (R) is the correct explanation of Assertion (A).
2. Both Assertion (A) and Reason (R) are correct but Reason (R) is not the correct explanation of Assertion (A).
3. Assertion (A) is true, but Reason (R) is false.
4. Assertion (A) is false, but Reason (R) is true.

Assertion (A) : The Sarajevo crisis was the immediate cause of the First World War.

Reason (R) : Austria blamed Serbia for murder of Prince Francis Ferdinand and declared war on Serbia.

Both Assertion (A) and Reason (R) are correct and Reason (R) is the correct explanation of Assertion (A).

Explanation — The secret society, called the 'Black Hand' or 'Union of Death' of Serbia murdered the Austrian Prince Archduke Francis Ferdinand in the Bosnian capital of Sarajevo on June 28, 1914. Austria-Hungary put the blame on the Serbian Government for this crime. As Serbia refused to comply with some of the conditions, Austria-Hungary declared a war against Serbia on July 28, 1914. Many countries then joined the war in support of one or the other.