The correct answer is B. Stroll.
A stroll is a leisurely walk, typically taken for pleasure or exercise. It is a slow, relaxed walk, often taken in a park or other scenic area. Strolling is a good way to get some exercise and fresh air, and it can also be a social activity, as it is often done with friends or family.
A jog is a faster type of walk, and it is often used as a form of exercise. Jogging is a good way to improve your cardiovascular health, and it can also help you lose weight.
A gallop is a very fast type of walk, and it is typically used by horses. Galloping is a very strenuous activity, and it is not recommended for humans.
A promenade is a formal walk, and it is often taken in a public place, such as a park or a promenade. Promenades are typically done in groups, and they can be a social activity.