Which statements correctly describe the Ottoman Empire?

Choose all answers that are correct.

AKnown as Süleyman the Magnificent in Europe, this leader was known by his own people as "the Lawgiver."
BThe empire expanded because of its well-disciplined, well-equipped, and well-trained army.
COsman signed peace treaties with the Safavid Empire because both populations were part of the same branch of Islam.
DMost of the people of the Ottoman Empire were Sunni Muslim.
EThe empire was founded by Constantine in the sixth century.

Verified Answer :

Neuron

The best description of the one's you've provided for the Ottoman Empire would be that 

A - known as Süleyman the Magnificent in Europe, this leader was known by his own people as "the lawgiver"
d - Most of the people of the Ottoman Empire were SUnni Muslim

These two are most likely true. For all the other answers it's very questionable whether they are true because we don't know the time period for which you're asking. They could or couldn't be true, with the exception of E.