What are the minimum criteria that define a high-power rocket?

The criteria defining a high-power rocket primarily focus on the total impulse delivered by its motor. Specifically, a high-power rocket is characterized as having a single motor that produces more than 160 Newton-seconds of total impulse. This measurement is crucial because total impulse is a direct indicator of the rocket's power and performance capabilities, enabling it to reach higher altitudes and achieve greater speeds compared to lower-power rockets.

The specification of a single motor exceeding this total impulse is significant as it helps distinguish high-power rockets from others, ensuring uniformity in safety regulation and performance. This is why option B is the correct choice; it accurately reflects the established standards in rocketry.

The other options either do not meet the criteria for defining high-power rockets or are too vague to offer a clear definition. For instance, just having a maximum thrust rating does not necessarily indicate whether a rocket qualifies as high-power, as thrust and total impulse are different parameters. Additionally, the number of motors does not inherently classify a rocket's power level, as a single powerful motor may outperform multiple lesser ones. Lastly, a small model rocket described by specific colors lacks any parameters related to performance or power, further distancing it from the definition of high-power rocketry.