If the electric flux entering and leaving an enclosed surface respectively is `phi_1` and `phi_2`, the electric charge inside the surface will be
A. `(phi_(2)-phi_(1)) epsilon_(0)`
B. `(phi_(1)+phi_(2))//epsilon_(0)`
C. `(phi_(2)-phi_(1))//epsilon_(0)`
D. `(phi_(1)+phi_(2))epsilon_(0)`