Answer:
Option b - {-6, -5,-4,-3,-2,-1}
Explanation:
Given : Set

To find : List all of the elements of set a ?
Solution :
In Set

there is an equal sign so -6 includes in the set.
there is no equal sign so 0 is not include in the set.
From -6 to 0 the number lies in between are -5,-4,-3,-2,-1.
So, The elements of set
are {-6, -5,-4,-3,-2,-1}
Therefore, Option b is correct.