You will be given a definition of a task first, then some input of the task.
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 were the combined number of casualties from the battles of Orthez and Toulouse during the time that Kempt led his brigade there? Passage:Employed from 1807 to 1811 on the staff in North America, Brevet-Colonel Kempt at the end of 1811 joined Arthur Wellesley, Marquess of Wellington's army in Spain with the local rank of major general, which was, on 1 January 1812, made substantive. As one of Thomas Picton's brigadiers, Kempt took part in the great assault on Badajoz and was severely wounded. On rejoining for duty, he was posted to the command of a brigade of the Light Division (43rd Regiment of Foot, 95th Rifles, and 3rd Portuguese Light Infantry) in time to fight at the Battle of Vitoria on 21 June 1813. He also led his brigade at the Battle of the Pyrenees at the end of July, and at the Battle of the Bidassoa, where his troops stormed French defenses near Mont La Rhune on 7 October. While still commanding his brigade at the Battle of Nivelle on 10 November, he was again wounded. In 1814, he led his brigade at the battles of Orthez and Toulouse.
Links: a. Brevet (military) b. Battle of the Bidassoa c. Major general d. Battle of Orthez
Output:
d