In the following passage some of the words have been deleted. Read the passage carefully and select the correct answer for the given blank out of the four alternatives.

Comprehension:
The figure of Arthur first appeared in Welsh poetry in the (1) __________ sixth and early seventh centuries, a hero who was (2) ___________ lead the Britons in battle against Saxon invaders. But it wasn't (3) ___________ the 12th century that he was first tied to this dramatic headland, known as Tintagel.
The timeless popularity of the Arthur legend has overshadowed a central, unresolved (4) __________ : Was there really a King Arthur, or at least a historical prototype upon whom Geoffrey's hero is (5) __________?