Angle a and angle b are both supplementary angles. what must be true about the angles?

Not sure if there're any answer choices of some sort,

but if the angle a and angle b are supplementary, that means when you add their measures together they must equal 180.

m∠5 + m∠3 = m∠1   is true.

m∠5 + m∠6 = 180 is true

m∠2 +m∠3 = m∠6   is true

m∠2 +m∠3 +m∠5 = 180   is true