Fill in the blank with an appropriate option.
The makers of sports drinks spend tens to hundreds of millions of dollars ______ their products each year.

Correct option is D

Use “advertising” to fill in the blank.
· Varying - changing or differing in some way, often in terms of size, quantity, quality, or intensity.
· Snacking - eating a small amount of food between meals, often as a quick snack or to satisfy hunger.
· Lingering - staying in a place or continuing to exist or persist for a long time, often beyond the expected or desired duration.
· Advertising- A means of communication with the users of a product or service.