Which of the following terms would best describe a period of rest during an activity?

The term "Break / Rest" accurately describes a period of rest during an activity as it clearly conveys the idea of taking a pause or respite. In various contexts, a break or rest is an intentional interruption in the flow of an activity, allowing individuals to recharge and recuperate physically or mentally before resuming their tasks.

In contrast, the other options do not fit as well in this context. A snack typically refers to food consumed between meals rather than a specific rest period. While "route" relates to a pathway or direction taken during an activity, it does not imply a pause in that activity. The term "lago" does not have a recognized meaning in this context related to resting or taking a break. Therefore, "Break / Rest" is the most appropriate choice for defining a period of rest within an activity.