A river is flowing with a speed of \( 1 \mathrm{~km} / \mathrm{hr} \). A swimmer wants to go to ...

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A river is flowing with a speed of \( 1 \mathrm{~km} / \mathrm{hr} \). A swimmer wants to go to point ' \( C \) ' starting from ' \( A \) '. He swims with a speed of \( 5 \mathrm{~km} / \mathrm{hr} \), at an angle \( \theta \) w.r.t. the river. If \( A B=B C=400 \mathrm{~m} \). Then the value of \( \theta \) is :
(A) \( 37^{\circ} \)
(B) \( 30^{\circ} \)
(C) \( 53^{\circ} \)
(D) \( 45^{\circ} \)
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