A box contains `N` molecules of a perfect gas at temperature `T_(1)` and temperature `P_(1)`. The number of molecule in the box is double keeping the total kinetic energy of the gas same as before. If the new pressure is `P_(2)` and temperature `T_(2), then
A. `P_(2) = P_(1), T_(2) = T_(1)`
B. `P_(2) = P_(1), T_(2) = (T_(1))/(2)`
C. `P_(2) = 2P_(1), T_(2) = T_(1)`
D. `P_(2) = 2P_(1), T_(2) = (T_(1))/(2)`