In latvia, only one six-lane highway exists, connecting riga, its capital, with moscow. otherwise, the roads are two lanes and many are made of cobblestones or bricks. this limits the speed with which deliveries can be made and requires that delivery trucks be quite small. the road network in latvia is an example of problems with a country's

Problems with a countries economic infrastructure

Explanation:

The road network is part of a countries economic infrastructure and in a situation where it is not good or sufficient it becomes an infrastructural problem that may affect various economic activities.

Due to the nature of the roads in Latvia, delivery trucks have to be small and thus delivery rate reduced, this is a typical example of an inefficient economic infrastructure (road networks)

the answer your looking for is c. : )