The answer is C: orange triangle.

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