During deep-water exercises, the caloric expenditure at higher intensity can reach:

The correct choice indicates that during high-intensity deep-water exercises, caloric expenditure can indeed reach significant levels, reflecting the strenuous nature of such activities. At higher intensities, the body's demand for energy increases substantially, leading to a higher rate of caloric burn due to the increased effort required to work against water resistance.

The option selected suggests a realistic range that aligns with physiological studies showing that vigorous aquatic activities can yield caloric expenditures nearing 18.9 kilocalories per minute. This value accurately encapsulates the intense metabolic demands faced by individuals engaging in such exercises, which can include swimming, water aerobics, or other forms of deep-water training.

This high caloric expenditure reflects the effectiveness of deep-water workouts in promoting cardiovascular fitness and muscular endurance. In comparison, other options might suggest lower figures that do not capture the full energy expenditure observed during high-intensity exercises in water.