The correct answer is A. node degree.
Node degree is the number of connections a node has to other nodes in a network. It is a measure of the node’s importance in the network. A node with a high degree is a hub node, and a node with a low degree is a peripheral node.
Path length is the number of edges in the shortest path between two nodes. It is a measure of the distance between two nodes in the network.
Social circle is a group of people who are connected to each other through social relationships. It is a measure of the social network of a person.
Bridge is an edge that connects two otherwise disconnected components of a network. It is a measure of the connectivity of a network.