What is the focus of the bandwagon advertising style? to try to persuade someone to do something based on the fact that “everyone’s doing it” to try to persuade someone to avoid doing something based on the fact that “it’s unhealthy” to try to persuade someone to do something based on the fact that “statistics show it’s good” to try to persuade someone to avoid doing something based on the fact that “it causes cancer”

The focus of the bandwagon advertising style is to try to persuade someone to do something based on the fact that "everyone's doing it."
For example, today's girls all have eyebrows "on fleek" because everybody's doing it. It's a banal example, but it paints the picture clearly.

Mass is the amount of matter in an object.  weight is the measurement of the pull of gravity on an object.  say for example, you travel to the moon which has a different gravitational field compared to the gravitational field of earth. (gravitational fields: earth = 1, moon = 0.165)  now when you are on the moon, the pull of gravity on you is different than on the earth. and as weight is the measurement of the pull of gravity on an object, that means yes, your weight can and will change on the moon.  however, on the moon, on earth or even on jupiter, the amount of mass inside of you remains the same. meaning your physical mass remains constant.  in conclusion it is possible for your weight to change as your mass remains constant.