Which of the Following Describes a Characteristic of Fat Use

Which of the following describes a characteristic of fat use during physical activity?

A) It is released as fatty acids from internal fat stores and subcutaneous fat
B) Upon commencement of an activity,blood fatty acids rise to provide an immediate source of fuel
C) Fat that is present within the muscle fiber represents the primary source of energy for that muscle
D) After consumption of a high-fat diet for at least 3 days,physical activities are performed as efficiently as from intake of a high-carbohydrate diet