The correct answer is B. 2.
Step-by-step explanation
The image shows a map with latitudinal (horizontal) and longitudinal (vertical) lines. The equator line is the latitudinal line that is in the center of the Earth dividing the northern and southern hemispheres, it takes its name from its location above the country called Ecuador. According to the above, it can be established that the line marked with the number 2 is the line that represents the equator because it passes over this country and divides horizontally the two hemispheres of the earth. So the correct answer is B.