Four angles are formed by the intersection of the diagonals of this quadrilateral. which statement is not true?

a) ∠1 and ∠2 are adjacent.

b) m ∠2 = 180° – 120°

c) m ∠1 = 120° because ∠1 and the 120° angle are vertical angles.

d) m ∠1 = m ∠2