'Arteries of circulation' have been often described as metaphor for the:

Network of Roads

The correct answer is Option (1) → Network of Roads

We often talk of the ‘face’ of the earth, ‘eye’ of the storm, ‘mouth’ of the river, ‘snout’ (nose) of the glacier, ‘neck’ of the isthmus and ‘profile’ of the soil. Similarly regions, villages, towns have been described as ‘organisms’. German geographers describe the ‘state/country’ as a ‘living organism’. Networks of road, railways and water ways have often been described as “arteries of circulation”.