Question

Historians attempt to answer the a0, a1, a2, a3, and a4 questions of history.

Answer 1

If this is a true or false question, yes this is true since information of the periods of time in the A.D. era are still not 100% accurate, and there's many questions regarding the actual events leading up to others, and questions about specific resources/items that were able to be recovered FROM those time periods. 

Answer 2

Historians attempt to answer the

who

a0,

what

a1,

when

a2,

where

a3, and

where

a4 questions of history.