I keep getting C and D on this quiz, I value my grades and education NOT SURE HOW THIS IS HAPPENING! How can you increase the gravitational potential energy (GPE) of an empty shoe box on the middle shelf of a bookcase? Question options:

all of the options listed here will increase the GPE

add items to the box to increase its mass on the self it is on

raise the box to a higher shelf

add items to the box and raise it to a higher shelf