C) is correct.
"it difficult to prove damage" should be followed by the counter to the difficulty or the reason of the difficulty.
A)"if" implies on testimony the damages will be successfully proved. Also the structure is awkward and wordy.
B)"here will be" implies sufficient condition to a successful outcome. "There will be another doctor" is awkward.
D)passive
E)connector identifying the contrast such as unless etc or connector supporting statement is missing.

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Posted by sanand to 1000SC at 6/03/2006 02:53:45 AM