What is approximate distance between the following points: C(1,2.5) and D(6.5,5.5) ?

In a rectangular axis system, what is approximate distance between the following points: C(1,2.5) and D(6.5,5.5) ?
A. 5.5.
B. 7.2.
C. 6.3.
D. 4.1.
E. 3.8.

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