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Which of the following sets of numbers could be the lengths of the sides of a triangle?

A. 3.5 cm, 7 cm, 10.5 cm
B. 3.5 cm, 7 cm, 14 cm
C. 3.5 cm, 3.5 cm, 3.5 cm
D. 3.5 cm, 5 cm, 10 cm