a) No. it cannot have 4 acute angles because total sum of all 4 angles = 360 degrees
b) Yes, an obtuse angle has > 90 degrees so a quadrilateral can have angles
100, 100 , 100 and 60 for example.
c) Yes A reflex angle has value between 180 and 360 so you could have a quadrilateral whose angles are 270, 30, 30, 30 for example.
d) No because the sum of any 2 reflex angles is greater that 360 degrees