The correct answer is - B. Streets follow straight lines and often run north-south or east-west.
A city with a grid plan, is usually a city that has made a very good and practical urbanization. The grid plan in a city would mean that the streets are running in straight lines, north-south and east-west. The streets that go into one direction are parallel to each other, and with the streets that come sideways they are intersecting at a 90 degree angle.
This type of road structure in the city makes it much more easier for the movement of the people, as well as much more easier to orientate into the space. It is also safer because the view of the drivers is relatively big.
