Explanation:

The pattern followed in this question is as follows
there are two figure, outer one that is initially a hexagon, and an inner one which is growing it's edges with each step.
with each step, one edge of the hexagon is getting removed and one edge is getting added to the inner figure summing up the total
number of edges in the complete diagram to be same.
step 1
Outer figure - 6 edges, Inner figure - 0 edges
step 2
Outer figure - 5 edges, Inner figure- 1
step 3
outer figure- 4, inner - 2
therefore in step 4, the outer figure should be having 3 edges and inner figure 3 edges.
the only option with the required conditions is option B.
hence, the correct answer is option B.