Answer:
A. All of the answers are true, however:
Explanation:
It is improper to state that it led to the "discovery" of the Americas, as discovery is quite subjective, and the Europeans were not the first people group to arrive to the Americas. If you were only talking about the European perspective, it is a correct statement, however, this is viewed through the lends of history, and therefore is not a 100% true statement. Instead, it should be: "the voyages eventually led to the Europeans finding out the existence of the Americas".
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b. Boris Yeltsin
The first president of the Russian Federation
Answer: diseases
Measles and Black Death/Bubonic Plague were both diseases, and they were very common among Medieval Europeans. The answer to the question is diseases.
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Answer:
He was an accomplished military leader whose rule has been the subject of praise, though he has also been described as the most controversial ruler in Indian history. He was a notable expansionist; during his reign, the Mughal Empire reached its greatest extent, ruling over nearly all of the Indian subcontinent.