Answer
Top arrow: From a bond to a lone pair.
Middle arrow: From a lone pair to a bond.
Bottom arrow: From a bond to a bond.
Work Step by Step
1. Identify where the tail of the arrow is:
Top arrow: Bond.
Middle arrow: Lone pair.
Bottom arrow: Bond.
2. Identify where the head is going to:
Top arrow: A Bromine. (Lone pair)
Middle arrow: Is going to form a bond.
Bottom arrow: Is going to form a bond.
** The dotted line represents a bond that is going to be formed.
Therefore:
Top arrow: From a bond to a lone pair.
Middle arrow: From a lone pair to a bond.
Bottom arrow: From a bond to a bond.