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: How old was the HMS Spartiate the year Hamond was promoted to rear admiral? Passage:Promoted to rear admiral on 27 May 1825, Hamond travelled in the third-rate HMS Spartiate on his new mission to deliver the treaty of separation between Brazil and Portugal to King John VI of Portugal. He inherited his father's baronetcy in September 1828. He was advanced to Knight Commander of the Order of the Bath on 13 September 1831 and became Commander-in-Chief, South American Station, with his flag in the third-rate HMS Spartiate, in September 1834. Promoted to vice admiral on 10 January 1837 and to full admiral on 22 January 1847 he was advanced to Knight Grand Cross of the Order of the Bath on 5 July 1855. He was appointed Rear-Admiral of the United Kingdom on 22 November 1860 and Vice-Admiral of the United Kingdom on 5 June 1862 before being promoted to Admiral of the Fleet on 10 November 1862.
Links: a. Spartiate b. Rear-Admiral of the United Kingdom c. Pacific Station d. HMS Spartiate (1798)
a