The triangle shifts one place clockwise and also inverts every time it shifts. That gives options A and B. The dark circle shifts anti-clockwise so now it will be below. So the answer figure (a) is correct.
First a 6-sided figure encloses (6 - 1= 5-sided figure.
Then a 5-sided figure encloses (5 - 1 = 4-sided figure.
So, The answer must be a 3-sided figure enclosing a 2-sided figure.
So answer figure d should be next.