If the scalar product of two vectors, 
and 
, is equal to ?3.5, if 
align="middle" />, and the angle between the two vectors when they are drawn starting from the same point is equal to 130°, what is the magnitude of ?
A. 2.1
B. 2.5
C. 2.3
D. 2.7
E. 3.1
Answer: D
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