Who is the 19th-century socialite depicted here?

All of the answer options were "confidantes" or mistresses of "Bertie", Queen Victoria's son, the Prince of Wales, later King Edward VII.

-- Lady Randolph Churchill (née Jennie Jerome; 9 January 1854 – 29 June 1921) was the American-born wife of Lord Randolph Churchill and mother of Winston Churchill. It was Bertie who introduced her to Randolph and the couple were married at the British Embassy in Paris on 15 April 1874 Randolph suffered from a debilitating illness and died young. Lady Randolph had affairs with Bertie, with Evelyn Boscawen, 7th Viscount Falmouth and with others. After Randolph's death she married George Cornwallis-West in 1900. This ended in divorce in1914, and she married Montagu Porch in 1918.

-- Frances Evelyn "Daisy" Greville, Countess of Warwick (née Maynard; 10 December 1861 – 26 July 1938) was a campaigning socialist who supported schemes to aid the less well off. She was the subject of the popular music hall song "Daisy, Daisy".

-- Alice Frederica Keppel (née Edmonstone; 29 April 1868 – 11 September 1947) grew up at Duntreath Castle, in Scotland. Her beauty, charm and discretion impressed London society and she became one of the best society hostesses of the Edwardian era.

-- Emilie Charlotte Langtry (née Le Breton; 13 October 1853 – 12 February 1929), known as Lillie Langtry was a British-American actress and producer. She was born in Jersey, moved to London in 1876 after her marriage and became much sought-after in London society.