Indira Gandhi was the prime minister of India. She was killed by her ‘Sikh Bodyguards’ Satwant Singh and Beant Singh. It is believed to have happened because of the so called Operation Blue Star, which was a military action that was meant to remove the militant religious leader Jarnail Singh Bhindranwale and his many followers from the buildings of the Harmandir Sahib ( the Golden Temple). It seems this resulted in the death of many Sikh, which caused a raising sentiment of rage and injustice int he community.
The reason why the Mongols withdrew form Asia was because of horrible weather conditions and diseases. If I had to pick, I would pick A.) Diseases because A is more severe then the weather conditions.