True. The presence of cracks in a material can significantly reduce its fracture toughness (KIC), which is a measure of a material's resistance to crack propagation. The larger the cracks, the lower the fracture toughness. In this case, since Glass A has many cracks of up to 2 mm maximum length while Glass B only has a few cracks with maximum lengths of <1 mm, it can be concluded that Glass A will have a lower fracture toughness (KIC) than Glass B.