[单选题]
Two displacement vectors have mat4r p paz (gdjj976z;zgnitudes of 5.jst i/4/; bm-ua)w 8yfo knj6s0 m and 7.0 m, respectively. When these two vectors are added, the magnitude of the )m b8stnjsji -/4fo yku; a/6wsum
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.
