There can never be an answer. But probably blonde.
coarse hair is thick hair
The homophone of "course" is "coarse." "Course" refers to a path or direction, while "coarse" means rough or not fine in texture.
Example sentence(s) - The salt is coarse ground. She has long, coarse hair.
Blonde
Coarse hair is often the result of over using products and straighteners. in order to help coarse hair, you should use intensive treatment conditions, apply this twice each time you wash your hair for added effect. Hair masks ( such as in the herbal essences range) will also help coarse hair by renewing lost moisture in the hair. If you do use lots of hair products ( such as hair spray) or straighten hair lots, give your hair a rest from using them, as they will only damage hair further.
course
Obviously Blonde Hair
most likeky brown hair
black hair.
Black, it has the most melanin so the hair is thicker
black color
There is a myth here that you should shave in order for the hair that grows back afterwards to be coarse. This may be true, so you should shave and when it grows back, it would be coarse.