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The Evolution of the Photofit

Security technology: A new type of computerised photofit system takes a novel evolutionary approach to generating images of suspects. If you have ever tried to describe someone’s face in detail, you will understand why the "photofit" composite images used by the police look so dodgy. In recent years, computerised "E-Fit" systems have helped improve the accuracy of these images by allowing witnesses to choose from a wider range of facial features. But researchers at the University of Stirling in Scotland found that, despite these improvements, people still have a hard time constructing recognisable faces--especially if there is a delay of more than a few hours between seeing the face and generating the composite.
The problem is that people tend to recognise faces as whole entities, rather than as separate features. So picking from a range of eyes, noses a
A. evasive
B. competitive
C. urgently
D. unlike