The main idea of Wegener's continental drift theory was that Land masses move across Earth's surface over time. That is option D.
The continental drift theory is the theory that believes that the earth surface is made up of land masses which drifts across the Earth, sometimes plowing through oceans and into each other.
The continental drift theory is most associated with the scientist Alfred Wegener, whom in the early 20th century believed that Land masses move across Earth's surface over time.
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