If, when the two parties of knights encounter one another after a month, exactly one knight changes from one travelling party to the other travelling party, that knight must be  Choose the correct choice from the following answers:	A) P	B) Q	C) R	D) S	E) T
Q because Q always have to travel in northern route   ANSWER:Q
<result>B</result>
If, when the two parties of knights encounter one another after a month, exactly one knight changes from one travelling party to the other travelling party, that knight must be