The hydrolysis of atp to adp is the hydrolysis of atp to adp is
a. isothermic
b. exothermic
c. an oxidation
d. endothermic
e. a reduction

The hydrolysis of ATP to ADP is  exothermic

The hydrolysis of ADP to ATP is endothermic

Explanation:

This is the reaction that can explain what happens in the hydrolisis of ATP and ADP:

ATP + H2O ⇋ ADP + Pi + energy

As we can see in the reaction to produce energy we need water (that's why it's so important to drink a lot of water) and ATP, the ATP is also called the energy molecule because when she gives one phosphate group she  frees energy to the medium.

Conversely to add one phosphate to the ADP we need energy to bind it and creat an ATP molecule, in this process water is liberated.

In other words, the ATP hydrolysis liberates energy so it's exothermic. And the ADP hydrolysis needs energy for that reason it's endothermic.