Given the task definition and input, reply with output. This task involves asking a question, providing a set of 2 options. You are expected to choose the best answer to the question. The output will be in the form of A or B, corresponding to which option is chosen.

Question:What is the next in the series: Nigeria, Sierra Leone, Tanganyika, Uganda, Zanzibar, Kenya, Malawi, Zambia, Gambia, Botswana, Lesotho, Mauritius? ,  Options: [A.Kingdom of Swaziland B.Sierra Leone] 

B