Given the task definition and input, reply with output. In this task, you're given a question, a context passage, and four options which are terms from the passage. After reading a passage, you will get a brief understanding of the terms. Your job is to determine by searching and reading further information of which term you can answer the question. Indicate your choice as 'a', 'b', 'c', or 'd'. If you think more than one option is plausible, choose the more probable option to help you answer the question.

Question: What age was John Fisher when he replaced Kerr?
Passage:Kerr became Second Naval Lord again in May 1899 before being made First Naval Lord in August 1899, and promoted to full admiral on 21 March 1900. Following the succession of King Edward VII, he was advanced to Knight Grand Cross of the Order of the Bath (GCB) in the 1902 Coronation Honours list published on 26 June 1902, and received the insignia in an investiture on board the royal yacht Victoria and Albert outside Cowes on 15 August 1902, the day before the fleet review held there to mark the coronation. He was then promoted to Admiral of the Fleet on 16 June 1904. During his time as First Naval Lord Kerr presided over a period of continued re-armament in the face of German naval expansion but was unceasingly harassed by Admiral Sir John Fisher until he was replaced by Fisher in October 1904.
Links: a. Cowes b. Coronation of Edward VII and Alexandra c. Coronation of Edward VII and Alexandra d. John Fisher, 1st Baron Fisher
d