Reading - correct answer

Hi everyone! I try to do this Reading as a prepration for CAE exam. I would like to know why the correct answer is A). I can't find anything about artefact and it seems rather weird to me! Can anyone it check it out?
Thanks!

The silence of historians on the subject of colour, or more particularly their difficulty in conceiving colour as a
subject separate from other historical phenomena, is the result of three different sets of problems. The first
concerns documentation and preservation. We see the colours transmitted to us by the past as time has altered
them and not as they were originally. Moreover, we see them under light conditions that often are entirely
different from those known by past societies. And finally, over the decades we have developed the habit of
looking at objects from the past in black-and-white photographs and, despite the current diffusion of colour
photography, our ways of thinking about and reacting to these objects seem to have remained more or less black
and white.

What is the first reason the writer gives for the lack of academic work on the history of colour?
A There are problems of reliability associated with the artefacts available.
B Historians have seen colour as being outside their field of expertise.
C Colour has been rather looked down upon as a fit subject for academic study.
D Very little documentation exists for historians to use.