The answer is B: pink hexagon.

The rule
The pattern repeats every 3 things: pink hexagon, pink hexagon, pink triangle. 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 = ["pink hexagon", "pink hexagon", "pink triangle"]
for position in range(8):
print(position + 1, pattern[position % len(pattern)])
When you run it, Python prints:
1 pink hexagon 2 pink hexagon 3 pink triangle 4 pink hexagon 5 pink hexagon 6 pink triangle 7 pink hexagon 8 pink 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!