An ideal diatomic gas is caused to pass throguh a cycle shown on the `P-V` diagram in figure, where `V_(2) = 3.00V_(1)`. If `P_(1),V_(1)`,and `T_(1)` specify the state `1`, then the temperature of the state `3` is
A. `(T_(1)//3)^(1)`
B. `(T_(1)//3)^(4)`
C. `(T_(1))(1//3)^(0.4)`
D. `(T_(1)//3)^(2)`
