People can debate the aesthetic merits

People can debate the aesthetic merits of these overwrought, disquieting, sometimes gruesome works of art, but no one can dispute their creators' mastery of the paintbrush as a blunt instrument.

A. but no one can dispute their creators' mastery of the paintbrush as a blunt instrument.
B. but none can dispute their creators' mastery of the paintbrush as a blunt instrument.
C. but not a one can dispute their creators' mastery of the paintbrush as a blunt instrument.
D. but no person can dispute their creators' mastery of the paintbrush as a blunt instrument.
E.  but none can dispute to their creators' mastery of the paintbrush as a blunt instrument.

The best answer is B.  The use of none is idiomatically correct.  Choice E is incorrect because dispute can only be followed by a direct object.


For almost five thousand years after its beginning 2.5 million years ago, Homo habilis roamed the earth, lived in semi-permanent camps, gathered food and shared their economy.

A. For almost five thousand years after its beginning 2.5 million years ago,
B. Beginning 2.5 million years ago for a period of almost five thousand years,
C. Beginning a period of almost five thousand years 2.5 million years ago,
D. During five thousand years, a period beginning 2.5 million years ago,
E. Over a period of five thousand years beginning 2.5 million years ago,

The best answer is E.  Choice E is precise and idiomatically phrased.  Choice A is illogical because its refers grammatically to Homo habilis.  Choice B is less clear and direct.