Question:
Which political party did Cecil L'Estrange Malone belong to in Apr, 1918?

Context:
 Cecil L'Estrange Malone is a member of the Labour Party from Jan, 1922 to Jan, 1922. 
 Cecil L'Estrange Malone is a member of the Communist Party of Great Britain from Jan, 1920 to Jan, 1922. 
 Cecil L'Estrange Malone is a member of the British Socialist Party from Jan, 1919 to Jan, 1920. 
 Cecil L'Estrange Malone is a member of the Liberal Party from Jan, 1918 to Jan, 1919.

Answer:
Liberal Party