Answer: The correct option is
(d) the grass is green.
Step-by-step explanation: We are given the following statement :
p: The grass is green.
We are to find ~ ~ p.
We know that
~ p is the symbol for NOT p,
~ p : The grass is not green.
This implies that
~ ~ p : The grass is green.
So, ~ ~ p is same as p.
Therefore, ~ ~ p : The grass is green.
Option (d) is CORRECT.