21. A plant wound itself exactly 5 times around a pole with height 1 m and circumference 15 cm as shown in
the picture.
As it climbed, its height increased at a constant rate. What is the length of the plant?
(A) 0.75 m (B) 1.0 m (C) 1.25 m (D) 1.5 m (E) 1.75 m
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