Arrange the different stages of the discovering of Amaravati in a chronological order : (A) In 1854, Walter Elliot visited Amaravati and collected several sculpture panels. (B) The slabs from Amaravati were taken to different places like the India Office in Madras. (C) A local Raja stumbled upon the ruins of the stupa at Amarvati. (D) A British officer named Colin Mackenzie visited the site of Amaravati. Choose the correct answer from the options given below :