Final answer:
Pelops had six children, and among them were Atreus and Thyestes who are significant figures in Greek mythology, particularly in the narratives of the House of Atreus and the events leading up to and during the Trojan War.
Step-by-step explanation:
Of the six children that Pelops bore, two of them were Atreus and Thyestes.
These two figures are well-known in Greek mythology, primarily for their central role in the stories concerning the curse on the House of Atreus, which leads to various tragic events in the lives of their descendants, including Agamemnon and Menelaus in the Trojan War narratives. The correct answer to the question is a) Atreus and Thyestes.