Solution:Option(C) is correct
Impugn means to attack verbally as false or lacking integrity, to assail means to attack
Edit: Thank you Amit, for pointing out the incorrect answer choice. Changed the correct answer choice from option D to option C.
Error(s) Found !!!
Amit (Dec 16'15 at 22:10)
Option C "assail" is correct... tick is marked at D...
Thank you Amit for letting me know, changed the correct option value.
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