What Is Likely the Cause of the Increased Body Size

What is likely the cause of the increased body size in Homo erectus,compared to the body size of earlier hominids?

A) stone-tool use that facilitated root and tuber processing
B) increased protein in the diet,perhaps due to more intensive use of stone tools and cooking
C) increased intake of food,facilitated by larger teeth that permitted better food processing
D) warmer climates,which changed the overall shape of the hominin body plan