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It is hard to accurately measure the length of Rio Grande because

A. There are dangerous animals in the river.
B. The water in the river is constantly increasing and decreasing due to weather changes.
C. The river constantly changes course.
D. The river is dry because people drink form it
E. None of the above.
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সঠিক উত্তরঃ C. The river constantly changes course.
Explanation: