A gas is undergoing an adiabatic process. At a certain stage A, the values of volume and temperature `(V_(0), T_(0))`. From the details given in the graph, find the value of adiabatic constant `gamma`
A. `(V_(0))/(T_(0) tan theta) + 1`
B. `(V_(0) tan theta)/(T_(0) + 1`
C. `(V_(0) tan^(2) theta)/(T_(0)) + 1`
D. `(V_(0))/(T_(0)) + tan theta`