Atp is considered to be an energy carrier molecule. where is the energy actually located in this molecule?

a attached to the phosphate group
b in the bonds between phosphate groups
c attached to the nucleotide
d between the sugar and the phosphate

ATP  is the energy currency of living organism.

It is high energy molecule and provides energy to our body.

The energy releasing equation is

ATP --> ADP + iP + Energy

Where

ATP : Adenosine triphosphate

ADP : adenosine diphosphate

iP : inorganic phosphate

Thus when phosphate bond in ATP is cleaved to give diphosphate and inorganic phosphate energy is released (7.3 kCal approx / per mole)

so answer is

B in the bonds between phosphate groups

The bond is shown in figure as well