The reason for all market economies to have taxes to support armed forces, police forces, public schools, and at least some form of public transportation is because all countries have discovered that profits will motivate firms to solve most, but never all, of their economic needs. The answer to your question is D. I hope this is the answer that you are looking for and it comes to your help.
I think stream bank. It grows in moist places and wetlands, and is especially abundant along streamsides and riparian areas at elevations below 1400 m.