The given angles sum to less than 90°, so the remaining angle must be more than 90°. (The total of all angles is 180°.) Triangle ABC has an angle greater than 90°, so is obtuse. Since the triangles are similar, their corresponding angles are congruent. Hence ...
.. D. Triangle XYZ is obtuse.
The correct answer should be the worldwide system of stock markets.
It's actually a system of American stock markets and functions for the US economy. Historically some argue that it was based on a wall that protected from Indians, but it was more like a wooden palisade.It is the financial center of the US and the place of the NY Stock Exchange.