Detailed Instructions: You are given a paragraph, a question and some answer options (associated with "A", "B", "C", "D", etc.) You need to list all the correct answer options with their associated letters (e.g. "A" can be a valid answer). Note that sometimes, more than one option can answer the question correctly and completely. In those cases, please generate all such options separated by a comma (e.g. "A, B" is a valid answer). Do not generate anything else apart from one or more of the following characters: 'A', 'B, 'C', 'D', etc.
Q: Paragraph- Sent 1: Over the centuries, the living here has always been easy enough to attract a steady stream of immigrants.
Sent 2: Bountiful food sources might have made Malaysia an inviting place for the contemporaries of Java Man — in 230,000 b.c.
Sent 3: But thus far, the country's earliest traces of homo sapiens, found in the Niah Caves of northern Sarawak, are fragments of a skull dating to 40,000 b.c.
Sent 4: On the peninsula, the oldest human-related relics (10,000 b.c.
Sent 5: ) are Stone Age tools of the Negritos.
Sent 6: These small, dark Melanesians are related in type to Australian aborigines and are confined today to the forests of the northern highlands.
Sent 7: By 2,000 b.c.
Sent 8: , these timid, gentle nomads hunting with bow and arrow were driven back from the coasts by waves of sturdy immigrants arriving in outrigger canoes equipped with sails.
Sent 9: Mongolians from South China and Polynesian and Malay peoples from the Philippines and the Indonesian islands settled along the rivers of the peninsula and northern Borneo.
Sent 10: They practiced a slash-and-burn agriculture of yams and millet, a technique that exhausted the soil and imposed a semi-nomadic existence from one jungle clearing to another.
Sent 11: Families lived in wooden longhouses like those still to be seen today among the Iban peoples of Sarawak.
Sent 12: Another unit was added on to the communal dwelling each time a marriage created a new family.
Sent 13: Other tough migrants from the South Seas settled along the coasts — sailors, fishermen, traders (for the most part pirates) — known euphemistically as orang laut (sea people). 
Question: What were the oldest human-related relics found on the peninsula? (A) Skulls (B) Stone Age tools of the Negritos (C) Bow and arrow.
A:
B.