Adios amigos I am leaving

Top of the ears.

Explanation:

Sun burns can be defined as the the term which is used for the red and painful skin which is caused by the exposure to ultraviolet rays from the sun.

If a person is walking outside with sun over head then the area that will be most exposed to the sun will be top of the ear.

Sun burn can be one of the serious risk factor for the skin cancer.

Hence the correct answer is option D