The answer is C: green triangle.

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