Which of the following rivers empty into the black sea? A: Rhine
B: Danube
C: Tagus
D: Po

The danube river

Explanation:

There really isn't an explanation and more of an answer for this question.

most people now work in jobs where they do one  kind  of work; they are carpenters, bankers, cooks, mechanics, and so forth. likewise, most  businesses produce  only certainkinds  of  goods  or  services, such as cars, tacos, or gardening  services. this feature of  production  is known as specialization.