Use the Context Clues to Determine the Best Definition for the Bold

Multiple Choice

Use the context clues to determine the best definition for the bold word.
-Use the context clues to determine the best definition for the bold word. The unprecedented, never-before seen medical procedure drew doctors from around the world.
The procedure incorporated new techniques and instruments that other surgical facilities had not
Tried.

A) Routine
B) Customary
C) Unusual
D) Unique