Subject :IMO Class : Class 6

** Which of the following statement(s) is/are true ?**

(A) A parallelogram in which two adjacent angles are equal is a rectangle

(B) A quadrilateral in which both pairs of opposite angles are equal is parallelogram

(C) In a parallelogram the number of acute angles is zero (or) two

(D) All the above

how is (d) the correct answer