The answer is A: red triangle.

The rule
The pattern repeats every 3 things: red hexagon, red triangle, red 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 = ["red hexagon", "red triangle", "red triangle"]
for position in range(8):
print(position + 1, pattern[position % len(pattern)])
When you run it, Python prints:
1 red hexagon 2 red triangle 3 red triangle 4 red hexagon 5 red triangle 6 red triangle 7 red hexagon 8 red triangle
Pixel says: Try changing a number in the code and run it again. Can you make the pattern go on for 20 steps? Meow!