The answer is B: orange diamond.

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