I thought the answer is PTA but that isn't an option so I don't know, does anyone else have an idea and possibly an explanation?

Answer:
APT
Step-by-step explanation:
Make sure they are corresponding with each other so BRO in lefthand triangle corresponds with APT in the righthand one, therefore your answer is APT
Answer:
The answer is APT!
Step-by-step explanation:
The triangle is flipped, but is otherwise the same. So, wherever BRO is on the first triangle, APT will be on the second! I don't know if that explanation makes much sense, but I hope it helps haha.