In which war women over the age of 30 were granted the right to vote as a result of their contribution towards the war effort ?

• Crimean war
• Boer War
• Second World War
• First World War
  Explanation:

  "In 1918, women over the age of 30 were given voting rights and the right to stand for Parliament, partly in recognition of the contribution women made to the war effort during the First World War."