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In an acute-angled triangle ABC, the altitudes from A, B, C when extended intersect the circumcircle again at points A1 , B1 , C1 , respectively.

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In an acute-angled triangle ABC, the altitudes from A, B, C when extended intersect the circumcircle again at points A1 , B1 , C1 , respectively. If ∠ABC = 45° then ∠A1B1C1 equals 

(A) 45° (B) 60° (C) 90° (D) 135°

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Correct option(c)

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