$A$ person standing on the bank of a river finds that the angle of elevation of the top of a tower on the opposite bank is $45^\circ$. Which of the following statements is correct?
- ABreadth of the river is twice the height of the tower
- BBreadth of the river and the height of the tower are the same
- CBreadth of the river is half of the height of the tower
- DNone of the above
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