Which of the following statements is wrong ?

Correct option is C

Given
Definitions of different types of angles.
Formula / Concept used
· Acute angle: less than 90°
· Right angle: exactly 90°
· Obtuse angle: greater than 90° and less than 180°
· Straight angle: exactly 180°
· Reflex angle: greater than 180° and less than 360°
Solution
Statement (c) says that an angle of 180° is a reflex angle, which is incorrect. An angle of 180° is called a straight angle, not a reflex angle.
The correct option is (c)