Final answer:
Lepidus was the member of the Second Triumvirate who was made pontifex maximus to keep him out of the way after internal conflict arose among the triumvirs.
Step-by-step explanation:
The member of the triumvirate who was made pontifex maximus to keep them out of the way was d) Lepidus. After the formation of the Second Triumvirate by Octavian, Mark Antony, and Lepidus in 43 BCE to defeat Caesar's assassins and secure power in Rome, internal conflict eventually led to Lepidus being sidelined. Octavian and Mark Antony divided the Roman territories between themselves after Lepidus was pushed into retirement and stripped of most of his power, with Lepidus retaining only the religious title of pontifex maximus.