The picture above shows you line of: B. longitude.
What is a topographic map?
A topographic map can be defined as a type of map which contains an accurate and detailed graphical (two-dimensional) description, representation or records of both natural and man-made (artificial) features on the surface of planet Earth.
Generally, a topographic map make use of contour lines to represent points of equal elevation above sea level such as:
What is a line of longitude?
A line of longitude can be defined as an imaginary great circle of constant longitude on the surface of planet Earth which passes through the North pole (terrestrial pole) and South poles (Meridian) at right angles to the equator.
In this context, we can infer and logically deduce that the picture above shows a line of longitude.
Read more on line of longitude here: https://brainly.com/question/17355844
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