What are guiding lines, or leading lines, in a artwork?

A leading line paves an easy path for the eye to follow through different elements of a photo. Usually, these lines start at the bottom of the frame and guide the eye upward and inward, from the foreground of the image to the background, typically leading toward the main subject.

i came across this and i found it funny that when you're bored you play hangman on so im going to guess a : )

it is c) 24hrs

hope i !