Which energy depends the arbitrarily assigned zero level

Potential energy does.

A book on the floor has negative potential energy relative to the seat
of your chair, zero potential energy relative to the floor, and a whole
bunch of positive potential energy relative to the ground if the floor
is the floor of the passenger jet in which you are cruising and dropped
your book on the floor.

B) as the temperature increases, the kinetic energy of the particles increases.|-/