If $\vec { v }$ = 4 $\vec { P }$ = 3%,and

Multiple Choice

If $\vec { v }$ = 4%, $\vec { P }$ = 3%,and $\vec { Y } _ { R }$ = 2%,then $\vec{ M }$ must equal:

A) 1%.
B) 2%.
C) 6%.
D) 7%.