The answer is C: green hexagon.

The rule
The pattern repeats every 4 things: green hexagon, green hexagon, green star, green star. Then it starts again from the beginning.
The pattern as Python code
Here is a tiny Python program that follows the same rule. Type it into IDLE and run it to print the whole pattern, including the answer.
pattern = ["green hexagon", "green hexagon", "green star", "green star"]
for position in range(10):
print(position + 1, pattern[position % len(pattern)])
When you run it, Python prints:
1 green hexagon 2 green hexagon 3 green star 4 green star 5 green hexagon 6 green hexagon 7 green star 8 green star 9 green hexagon 10 green hexagon
Pixel says: Try changing a number in the code and run it again. Can you make the pattern go on for 20 steps? Meow!