Directions: Change the following sentence into a question:
Madhusudan knows how to cheat.

The given sentence uses the singular simple present tense ("knows"). To form a standard yes/no question, place the auxiliary verb "Does" at the beginning of the sentence, followed by the subject and the base form of the verb (know).
Option A is incorrect because it mistakenly keeps the "s" inflection on "knows". Option B applies the rule correctly.