Which statement of Hinduism is true?

The largest Muslim country in the world is:

In Crash Course with John Green he discussed Buddhist Stupas. He explains that they are places where Buddhist monastics are initiated into Buddhism.

According to the reading, who are the three most fundamental Hindu deities?

Who are the Sunni Muslims?

According to the LA TIMES article, the author says she did not go on the pilgrimage where they throw stones at the devil. She thought of this as too primitive.

The Mahayana school of Buddhism argues that one needs to be a monastic to be enlightened but the Theravada school of Buddhism says that any good Buddhist (monastic or not) can attain enlightenment in this lifetime.

Where was Buddhism founded? That is, where did Buddha give his first sermon and engage in missionary work?

How many spiritual leaders (Jain saints or gurus from the past) do Jains acknowledge?

According to Hinduism Today documentary, which statement is not true?