Venus Is the Only Planet in the Solar System That

Venus is the only planet in the solar system that rotates clockwise, or opposite the other planets. Which of the following is the most accepted scientific explanation for this?

A) Early in the history of the solar system there was a large impact that reversed the direction of Venus' spin.
B) Venus is denser than the other planets, which causes it to rotate in an opposing direction.
C) Early in the history of the solar system, Earth and Venus were so close to each other that their gravitational attraction caused them to spin in opposing directions.
D) Venus lacks a moon, which causes it to behave differently from the other planets.
E) Venus did not form with the rest of the planets, but was a stray asteroid that was captured by the Sun's gravitational field.