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<p><strong>A. lengths vary from6 m to12 m </strong></p> <p><strong>B. diameter of top of piles varies from40 cm to60 cm </strong></p> <p><strong>C. diameter of pile at bottom varies from20 cm to28 cm </strong></p> <p><strong>D. thickness of outer shell depends upon pile diameter </strong></p> <p><strong>E. all the above.</strong></p>
Option E
E. all of the above
I go with E all of the above
E. all the above.
