- A(a)
- B(b)
- C(c)
- D(d)
Step-by-Step Solution
From box to box one star is taken away (4, 3, 2, 1) and the colour switches between blue and yellow. Going back one step from the second box (4 blue stars), the first box must have 5 stars and be yellow: (b). (a) has the wrong colour, (c) repeats the number 4 and (d) counts the wrong way.
Answer: B) (b)