In DeltaABC D and E are the points on s...

In `DeltaABC` D and E are the points on sides AB and AC, respectively, such that DE || BC. If AD = 4 cm, BC = 5 cm. DC = 10 cm and AB = 15 cm. then the sum of the lengths of DE and EC is:

A. 20 cm

B. 15 cm

C. 21 cm

D. 18 cm

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