Which statement is INCORRECT for mutual inductance?

The change in the strength of the current in the coil is opposed by the coil itself by inducing an EMF.

The induced current developed in the neighboring coil opposes the decay of the current in the coil when the main current in the coil decreases.

In mutual inductance, out of the two coils, one coil opposes the change in the strength of the current flowing in the other coil.

The induced current developed in the neighboring coil opposes the growth of current in the coil when the main current in the coil increases.

Correct option is A

 When two coils are brought in proximity to each other, the magnetic field in one of the coils tends to link with the other.
 This further leads to the generation of voltage in the second coil.
 This property of a coil which affects or changes the current and voltage in a secondary coil is called mutual inductance.
 Mutual inductance, M, is the property whereby an E.M.F is induced in a circuit by a change of flux due to current changing in an adjacent circuit.
 A transformer is a device which uses the phenomenon of mutual induction to change the values of alternating voltages and currents.
 Considering two neighboring coils: the flux (f) associated with one coil is directly proportional to the current (l) flowing through the neighboring coil at any instant due to mutual induction. Mutual inductance is numerically equal to the magnetic flux through one coil when a unit current flows through the neighboring coil.
Formula:
ϕ∝I
ϕ=MI
So, when I=1,
ϕ=M