The diagram below shows two coils A and B placed parallel to each other at a very small distance. Coil A is connected to an ac supply. G is a very sensitive galvanometer. When the key is closed

• A

  Constant deflection will be observed in the galvanometer for 50 Hz supply

• B

  Visible small variations will be observed in the galvanometer for 50 Hz input

• C

  Oscillations in the galvanometer may be observed when the input ac voltage has a frequency of 1 to 2 Hz

• D

  No variation will be observed in the galvanometer even when the input ac voltage is 1 or 2 Hz