Which of the following is a form of latitude?

Latitude refers to the geographic coordinate that specifies the north-south position of a point on the Earth's surface. It is measured in degrees, with the Equator at 0 degrees latitude and the poles at 90 degrees north and south. Horizontal parallels are lines that run east to west and are used to indicate varying degrees of latitude.

In this context, horizontal parallels are specifically designed as consistent, equally spaced lines that mark locations of the same latitude, enabling a clearer understanding of geographical locations across the globe. This is essential for navigation and mapping as it forms a basis for specifying locations in various applications such as GPS and cartography.

Other options, like vertical parallels or diagonal lines, do not correctly represent latitude because vertical lines correspond more to longitude, which measures the east-west position, rather than latitude. Equatorial lines, while they reference the Equator itself, do not broadly describe the entire concept of latitude as a system. Therefore, horizontal parallels are the accurate representation of forms of latitude.