The gain of electrons is called
a. oxidation.
c. electrochemistry.
b. reduction.
d. half-reaction.

Reduction is the loss of oxygen from a molecule or the gaining of one or more electrons. 

So the answer would be b. reduction

This is what i found on google “when one phosphate group is removed by breaking a phosphoanhydride bond in a process called hydrolysis, energy is released, and atp is converted to adenosine diphosphate (adp). likewise, energy is also released when a phosphate is removed from adp to form adenosine monophosphate (amp).” i hope this you .

It dont even matter because at the end of thre day we gone life like it ius s