What Type of Stresses Broke Earth's Lithosphere into Plates

What type of stresses broke Earth's lithosphere into plates?

A) volcanism, which produced heavy volcanoes that bent and cracked the lithosphere
B) impacts of asteroids and planetesimals
C) cooling and contracting of the planet's interior, which caused the mantle and lithosphere to be compressed
D) internal temperature changes that caused the crust to expand and stretch
E) the circulation of convection cells in the mantle, which dragged against the lithosphere