Hey there! I'm happy to help!
There are a few answer options we can immediately remove here. Yakima is not a very large city, and neither is Spokane. It would not make much sense for them to be major financial centers because if they were they would have many tall buildings, a large population, etc.
Vancouver and Seattle are both big cities but Seattle has like triple the people and it has many famous headquarters like Starbucks. Seattle is known much more as a big city and it has many more tall buildings, so it would make sense that it is more of a financial center than Vancouver.
Therefore, the answer is A. Seattle.
I hope that this helps!