The eight planets in our solar system orbit the sun, which is at or in the center of the solar system. Which best explains the positions and movements of objects found in the solar system? A.
All positions and movements of objects found in the solar system are caused by the Sun’s powerful ultraviolet rays.

B.
The position and movements of smaller objects that have no gravity are controlled by the gravity exerted by larger objects.

C.
Gravity holds the planets in orbit around the Sun and moons in orbit around the planets.

D.
The position and movement of a planet randomly changes throughout its orbital period.

- "sack of constantinople, (april 1204). the diversion of the fourth crusade from the holy land to attack, capture, and pillage the byzantine city of constantinople divided and dissipated the efforts of the christians to maintain the war against the muslims. the fourth crusade was corrupted from its purpose early on."

- "the crusades were a series of religious wars undertaken by the latin church. the first crusade arose after a call to arms in 1095 sermons by pope urban ii. the first crusade unleashed a wave of impassioned, pious catholic fury, which was of constantinople, the capital of the christian-controlled byzantine empire."

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i would say b. research typically uses a variety of sources