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Which of the following statements is/are TRUE with respect to ideal MOSFET based DC-coupled single-stage amplifiers having finite load resistors?
The common-gate amplifier has an infinite input resistance
The common-source amplifier has an infinite input resistance
The input and output voltages of the common-source amplifier are in phase
The input and output voltages of the common-drain amplifier are in phase
Concept of active Resistance in MOSFET:
Thus, input resistance will be infinite when 
terminal 
input. It is possible in Common-Source Amplifier.
Thus, option (A) is wrong, option (B) is correct.
Common-Source Amplifies produces a 180° phase shift
Common- drain Amplifier produces 0° phase shift.
Thus, input and output voltages of Common-drain Amplifies are in phase.
Option (C) is wrong, option (D) is correct.
Hence, option (B) ant (D) are correct.