A conjectural portrait is a portrait made of a historical figure for whom no authentic contemporary portrait is available. The depiction, then, may be variously informed by written accounts of physical appearance, conjecture based on the subject's culture and background, and/or the artist's conception of the subject's inner essence.
Can we infer the following?
A conjectural portrait requires lots of skills to make

OPT:
 A). Yes
 B). It's impossible to say
 C). No
The answer is:
B).