Detailed Instructions: 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.
Q: Question: Which of the two offensives that Kubler's Mountain Corps was involved in began first? Passage:Ludwig Kubler (2 September 1889 18 August 1947) was a German General der Gebirgstruppe (Lieutenant General) who commanded the 1st Mountain Division, XXXXIX Mountain Corps, 4th Army and the Operational Zone of the Adriatic Littoral during World War II. He was awarded the Knight's Cross of the Iron Cross for his actions commanding the 1st Mountain Division during the invasion of Poland in 1939. He also commanded the division during the invasion of France and the Low Countries before being appointed to command XXXXIX Mountain Corps. During his command of this corps it was involved in the invasion of Yugoslavia and the attack on the Soviet Union. In December 1941 he was appointed to command the 4th Army, but was dismissed from this post in January of the following year, and placed in the Fuhrerreserve des Heeres (senior officer reserve pool). In September 1943 he was appointed as the commanding general of security troops for Army Group Centre on the Eastern Front, but the following month he was appointed to command the Operational Zone of the Adriatic Littoral, based at Trieste on the northern Adriatic coast. After being captured by Yugoslav forces at the end of the war, he was tried and executed for war crimes.
Links: a. Invasion of Yugoslavia b. General der Gebirgstruppe c. Operation Barbarossa d. Invasion of Yugoslavia
A:
a