Activity will have the LEAST effect on your level of physical fitness?

The correct answer is option D, Using an Electric mixer ( i hope this is the correct answer to what you are talking about because you didn't have any options but i gave out almost the same question to my students.)

Explanation:

Physical fitness is assured by activities in which our body is doing some kind of physical movements or exercise. In case of “walking to work “ the body is compelled to move or walk, in case of “carrying boxes up and down stairs” lot of physical work is done in both carrying the boxes and moving up and down the stairs, in the same way in case of “shoveling snow” some physical efforts are required to shovel the snow. But in case of using a  electric mixer, the only work being done is the “pressing of ON/OFF button”. Thus , "using an electric mixer" will have the LEAST effect on your level of physical fitness

c because the action was the roller coaster reaches bottom of hill (action) reaction would be blood tends to drain away from head

hope this !