B. should be adjusted to match the resistor being measured.
C. is very low.
D. is very high.
Actually, if you abduct genetically superior children at age six and rigorously train them with the best military tactics available, and then chemically augment their bodies and fit them with powered exoskeletons, i think you would find your answer.
C, is very low. It can still affect the circuit being measured, as it is not possible for it to have 0 resistance. Usually its resistance is insignificant relative to the resistance of the circuit it is inserted in.
B is impossible.
The internal resistances of an ammeter are compensated during the calibration.
A
C.
A. does not affect the circuit being measured.
B. should be adjusted to match the resistor being measured.
C. is very low.
D. is very high.
