Answer:
b. interval training.
Step-by-step explanation:
Interval training is a term mostly used in running training to improve resistances, which involves cardiorespiratory process, or aerobic processes.
When we hear about interval training, most of the time refer to speed races, jogs, and walking activities. This type of training is used to specific goals, like a upcoming event.
On the other hand, resistance, strength and weight training refer to workouts that involve weight, to improve muscle development or body fat decrease.