Her new hair style looks very attractive.

Answer: Option C

Attractive : pleasing or appealing to the senses.
Unblooming : not come into or be in full beauty or health.
Grand : magnificent and imposing in appearance, size, or style.
Unbecoming : (especially of clothing or a colour) not flattering; unattractive.
Fascinating : extremely interesting.

Antonym of Attractive is Unbecoming