The correct answer is option b) perspicacious . . unpretentious
Doug was both perspicacious and unpretentious: he possessed penetrating acuity and discernment and was also extremely humble.
A colon in English is a sign for equality, therefore choice D is inappropriate according to the question.
The correct answer is B since a colon in this context symbolizes equality, sharpness, and humility in the given text. To be diligent is to work hard, yet to be supercilious is to be conceited.
Similar to this, other options also have unique connotations of their own. These option does not match with the question.
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