The correct option is D Squat low with hands on the knees and head between the hands.
When you are outside the house, and when there is lightning, it is advisable to squat low with your hands on your knees and head between your hands.
This position will make you the smallest target to be struck by lightning.
Other options comparatively have more surface area. So, the correct option is squat low with hands on the knees and head between the hands.