The answer is B (An app on your smartphone that tracks the nutritional status of foods you eat)
A healthy person who exercise's regularly
While you didn't provide any following sources, healthy sources of energy for humans are usually considered to be different types of fruits and vegetables, lean meats, wholewheat grains, nuts, seeds, and healthy oils. All these constitute a healthy human diet and are a healthy source of energy.
First question: No
Second question: Yes
Cell-based Culturing has advanced flu vaccines
