If buyers choose certain types of products by the way they look, smell, taste, or sound, marketers should focus most on appropriatea) line extensions. b) quality modifications. c) aesthetic modifications. d) sensory systems. e) functional modifications.

c) aesthetic modifications

Explanation:

Product modification are when changes are made to a product.

Aesthetic modifications is when changes are made to a product to make it more attractive to the senses. Modifications made includes changes to the look, smell, taste, or sound of a product.

Functional modification is when changes are made to the functions performed by a product to make it more useful, versatile or safe.

Quality modifications is when modification is made to improve the quality of a product - to make it more durable and to increase its useful life.

Line extension is when a firm adds more products to its already existing product line.