Marketing is the art of: buying more/paying more/selling more/talking more

Marketing is the art of selling more.

Explanation:

One of the most important things in the development of a business is marketing. Marketing is the process of getting people interested in the products you're offering. If you don't have customers, your business will not succeed. This is why nowadays businesses, no matter how big or small, invest as much as they can in marketing. The number of businesses only keeps growing, and the competition is getting bigger, which means that people need to work harder in order to find customers and sell as many products as possible.

you didn't list the options but im guessing it's resolving contradictions

the boy's acceleration toward the girl is 2.08 m/s^2.

explanation:

according the newton's third law, the force causing the girl accelerate towards the boy will be me with equal counter-force causing the boy to accelerate towards the girl. these forces will be of equal magnitude and allows us to determine the boy's acceleration:

the boy's acceleration toward the girl is 2.08 m/s^2.