Which of the following describes a "sweepstakes" in the context of contests?

A sweepstakes is defined by the element of chance, where winners are chosen randomly from a pool of participants. In this context, the description aligns well with the characteristics of a sweepstakes. Unlike contests that typically involve a skill component where participants must demonstrate their abilities, sweepstakes are purely based on luck, as names are drawn at random.

This distinction is crucial as it highlights that anyone who enters has an equal chance of winning, regardless of skill or ability. Other options, while related to contests or promotional activities, do not embody the key feature of random selection that defines a sweepstakes. For example, games of skill and promotions that require a purchase involve more specific criteria for participation and winner determination, which do not fit the randomness aspect central to a sweepstakes.