What is the historical writing system, derived from Pallava script, used in the earliest known Thai inscriptions?
ADevanagari
BGrantha script
CBrahmi script
DSukhothai script✓
The Sukhothai script, first attested in the Ramkhamhaeng Stele of 1292, is the ancestor of modern Thai writing, itself derived from the Khmer adaptation of the South Indian Pallava script.