What trend do you observe in electronegativity on the periodic table?
a. increase from left to right
b. increases from top to bottom
c. increases in all directions out from the element fluorine

whichever one it is, it's definitely not one that you included on the list you provided.

note: the given question is incomplete.

complete question is given below.

which is an example of kinetic energy?

a. the energy stored in ethanol  

b. a hockey puck sliding across the ice  

c. a compressed spring  

d. a ball sitting at the top of a ramp

solution: the kinetic energy is the energy posses by the virtue of the motion of the object.

in the given options, a, c and d are the example of potential energy because it is the energy posses by the virtue of the rest of the object. but option b has the kinetic energy as the object is in motion.

hence, a hockey puck sliding across the ice   is the apex example of kinetic energy.

so, the option (b) a hockey puck sliding across the ice   is the correct option.

i would say

conservation of mass

mass before something happens = mass afterwards