The correct answer is: B. Vds lesser than (Vgs – Vt)
In the resistive region, the MOSFET is operating in the linear region. This means that the drain current is proportional to the gate-source voltage, and the drain-source voltage has little effect on the current. The drain-source voltage is therefore less than the gate-source voltage minus the threshold voltage.
Option A is incorrect because the drain-source voltage is less than the gate-source voltage minus the threshold voltage.
Option C is incorrect because the gate-source voltage is greater than the drain-source voltage minus the threshold voltage.
Option D is incorrect because the drain-source voltage is greater than the gate-source voltage.