Q. A sufficient condition that a triangle T be a right triangle is that a2 + b2 = c2. An equivalent statement is

• (A) If T is a right triangle then a2 + b2 = c2.
• (B) If a2 + b2 = c2 then T is a right triangle.
• (C) If a2 + b2 6= c2 then T is not a right triangle.
• (D) T is a right triangle only if a2 + b2 = c2.