I believe the correct answer is the third one.
Answer is B, the railroad system going through the cities.
C: Similar events and trends often take place in different places during the same periods
…
Hopefully this help:)
The Correct Answer Is:
In mathematics, the Pythagorean theorem, also known as Pythagoras' theorem, is a fundamental relation in Euclidean geometry among the three sides of a right triangle. It states that the square of the hypotenuse is equal to the sum of the squares of the other two sides.
Hope This Helps!!!
-Austint1414
Although opportunity cost is definitely important, it is hard to put a "price" on the opportunity in many cases, which makes it unmeasurable. This is why economists focus almost exclusively on price.
