Answer:
By 1939 Jinnah came to believe in a Muslim homeland on the Indian subcontinent. He was convinced that this was the only way to preserve Muslims' traditions and protect their political interests. His former vision of Hindu-Muslim unity no longer seemed realistic to him at this time.
Explanation:
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A third group of Democrats formed the Constitutional Union Party and selected John Bell as their presidential candidate. Because the Democratic vote was spread so thin, Republican Abraham Lincoln defeated Douglas, Breckenridge, and Bell in the 1860 presidential election.
I think the third option would be a suitable answer.
This passage implies that the author is aware that new weapons have broadened the theater of war.
