[单选题]
Two displacement vectors have magnitudes of 5.pddwjb4yu+f9p. 4b -c0 m and 7.0 m, respectd(k )gp3ghc;pn d7l5nively. When these two vectors are added, the magngp3h cdn5(k;) p gn7dlitude 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.
