C.

According to Merriam-Webster dictionary, although scent, smell, odor and aroma are often used interchangeably, those four words mean slightly different things.  Scent applies to the specific smell given off by a substance, an animal, or a plant. (As in: this cabernet franc has the scent of violets).  Smell implies solely the sensation without suggestion of quality or character. (As in: a unique smell wafted out of the glass). Odor may imply a stronger or more readily distinguished scent or it may be equivalent to smell. (A wine with a strong odor). Aroma suggests a somewhat penetrating, usually pleasant odor. (The aroma of zinfandel just beginning to ferment).