[单选题]
Two displacement vectort ialab*oc8f*z)l,/4f gen v0s have mzdimi 4, 4/st n1lp57m 5uhawragnitudes of 5.0 m and 7.0 m, respectively. When these two vectorswrm ,tzhs5 p1d4auil4n7 / mi5 are added, the magnitude of the sum
A. is 2.0 m.
B. could be as small as 2.0 m, or as large as 12 m.
C. is 12 m.
D. is larger than 12 m.
