Consider the fleury's algorithm given below. Which of the following best suits the blank?

Graph must have 0 or 2 odd vertices  
if there are 0 odd vertices, start from any vertex 
if there are 2 odd vertices, start from any one of them 
follow any of the edge, always choose the ______________  
repeat for all the edges of the graph

A. non-bridge over the bridge

B. bridge over non-bridge

C. adjacent edges

D. opposite edges

Answer: Option A